Solving the Fraction-Based Linear Equation: 1/8x - 3/4 + 1/9 = -1/4 + 3/4x - 1/2x

Linear Equations with Multiple Fractional Terms

Solve for X:

18x34+19=28+34x12x \frac{1}{8}x-\frac{3}{4}+\frac{1}{9}=-\frac{2}{8}+\frac{3}{4}x-\frac{1}{2}x

❤️ Continue Your Math Journey!

We have hundreds of course questions with personalized recommendations + Account 100% premium

Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find X
00:04 Arrange the equation so that one side has only the unknown X
00:50 Factor 8 into 2 and 4
00:58 Reduce what we can
01:16 Find the common denominator here as well
01:23 Collect like terms
01:41 Multiply by denominators to find the common denominator
01:54 Write the fractions as one fraction and calculate
02:04 Isolate X by multiplying by the denominator
02:19 And this is the solution to the problem

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Solve for X:

18x34+19=28+34x12x \frac{1}{8}x-\frac{3}{4}+\frac{1}{9}=-\frac{2}{8}+\frac{3}{4}x-\frac{1}{2}x

2

Step-by-step solution

To solve the given linear equation 18x34+19=28+34x12x \frac{1}{8}x - \frac{3}{4} + \frac{1}{9} = -\frac{2}{8} + \frac{3}{4}x - \frac{1}{2}x , we need to follow these steps:

First, simplify both sides of the equation:

On the left-hand side, which is 18x34+19 \frac{1}{8}x - \frac{3}{4} + \frac{1}{9} :

  • Simplifying, it remains 18x34+19 \frac{1}{8}x - \frac{3}{4} + \frac{1}{9} .
  • Convert 34+19-\frac{3}{4} + \frac{1}{9} to a common denominator. The least common multiple of 44 and 99 is 3636.
  • 34=2736-\frac{3}{4} = -\frac{27}{36} and 19=436\frac{1}{9} = \frac{4}{36}, so 2736+436=2336-\frac{27}{36} + \frac{4}{36} = -\frac{23}{36}.
  • The left-hand side is now 18x2336 \frac{1}{8}x - \frac{23}{36} .

Now, simplify the right-hand side, which is 28+34x12x -\frac{2}{8} + \frac{3}{4}x - \frac{1}{2}x :

  • 28=14-\frac{2}{8} = -\frac{1}{4}.
  • Simplify 34x12x\frac{3}{4}x - \frac{1}{2}x. The common denominator for 34\frac{3}{4} and 12\frac{1}{2} is 44.
  • So 34x12x=34x24x=14x\frac{3}{4}x - \frac{1}{2}x = \frac{3}{4}x - \frac{2}{4}x = \frac{1}{4}x.
  • The right-hand side is now 14+14x-\frac{1}{4} + \frac{1}{4}x.

Combine like terms across the equation:

  • We aim to move all terms involving x x to one side and constants to the other.
  • Subtract 14x\frac{1}{4}x from both sides: 18x14x2336=14 \frac{1}{8}x - \frac{1}{4}x - \frac{23}{36} = -\frac{1}{4} .
  • Bring 2336-\frac{23}{36} to the right side: 18x14x=14+2336 \frac{1}{8}x - \frac{1}{4}x = -\frac{1}{4} + \frac{23}{36} .
    • Simplify and solve for x x :

      • 18x14x=18x28x=18x\frac{1}{8}x - \frac{1}{4}x = \frac{1}{8}x - \frac{2}{8}x = -\frac{1}{8}x.
      • Add 2336\frac{23}{36} to 14-\frac{1}{4}, by finding a common denominator of 3636.
      • 14=936-\frac{1}{4} = -\frac{9}{36}, so 936+2336=1436=718-\frac{9}{36} + \frac{23}{36} = \frac{14}{36} = \frac{7}{18}.
      • Now we have: 18x=718-\frac{1}{8}x = \frac{7}{18}.
      • Multiply both sides by 8-8 to solve for x x : (8)(18x)=(8)(718)(-8) \cdot \left(-\frac{1}{8}x\right) = (-8) \cdot \left(\frac{7}{18}\right).
      • This simplifies to x=5618=289 x = -\frac{56}{18} = -\frac{28}{9}.
      • 289-\frac{28}{9} can be rewritten as a mixed number: 289=319-\frac{28}{9} = -3\frac{1}{9}.

      Therefore, the solution is:

      x=319 x = -3\frac{1}{9} .

3

Final Answer

319 -3\frac{1}{9}

Key Points to Remember

Essential concepts to master this topic
  • Strategy: Combine like terms separately on each side first
  • Technique: Use LCD 36 to combine 34+19=2336 -\frac{3}{4} + \frac{1}{9} = -\frac{23}{36}
  • Check: Substitute x=319 x = -3\frac{1}{9} back into original equation ✓

Common Mistakes

Avoid these frequent errors
  • Moving variables incorrectly across the equals sign
    Don't subtract 14x \frac{1}{4}x from the left when it's on the right = wrong sign! This creates 18x+14x \frac{1}{8}x + \frac{1}{4}x instead of 18x14x \frac{1}{8}x - \frac{1}{4}x . Always change the sign when moving terms across the equals sign.

Practice Quiz

Test your knowledge with interactive questions

Solve for X:

\( x - 3 + 5 = 8 - 2 \)

FAQ

Everything you need to know about this question

Why do I need to simplify each side before moving terms?

+

Simplifying first makes the equation much easier to work with! Instead of juggling 6 separate terms, you get fewer terms to manage. It's like cleaning your room before rearranging furniture.

How do I combine fractions with different denominators?

+

Find the LCD (Least Common Denominator) of all fractions involved. For 34+19 -\frac{3}{4} + \frac{1}{9} , the LCD is 36, so convert: 2736+436=2336 -\frac{27}{36} + \frac{4}{36} = -\frac{23}{36} .

What's the difference between 34x12x \frac{3}{4}x - \frac{1}{2}x and regular fraction subtraction?

+

It's the same process! Convert to common denominators: 34x24x=14x \frac{3}{4}x - \frac{2}{4}x = \frac{1}{4}x . The x just comes along for the ride.

Why did we get a negative answer?

+

The coefficient of x became negative (18x) (-\frac{1}{8}x) after combining like terms, and we had a positive constant (718) (\frac{7}{18}) . When you divide positive by negative, you get negative!

How do I convert 289 -\frac{28}{9} to a mixed number?

+

Divide 28 by 9: 28÷9=3 28 \div 9 = 3 remainder 1 1 . So 289=319 -\frac{28}{9} = -3\frac{1}{9} . The negative sign applies to the entire mixed number.

🌟 Unlock Your Math Potential

Get unlimited access to all 18 Linear Equations (One Variable) questions, detailed video solutions, and personalized progress tracking.

📹

Unlimited Video Solutions

Step-by-step explanations for every problem

📊

Progress Analytics

Track your mastery across all topics

🚫

Ad-Free Learning

Focus on math without distractions

No credit card required • Cancel anytime

More Questions

Click on any question to see the complete solution with step-by-step explanations