Solve for X: 1.7 - 1/6x + 3/6x = 3.5 + 2/12x Linear Equation

Linear Equations with Mixed Decimal-Fraction Terms

Solve for X:

1.716x+36x=3.5+212x 1.7-\frac{1}{6}x+\frac{3}{6}x=3.5+\frac{2}{12}x

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find X
00:05 Collect like terms
00:13 Factor 12 into 2 and 6
00:27 Simplify what we can
00:33 Arrange the equation so that X is isolated on one side
00:51 Collect like terms
00:56 Isolate X
01:06 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:

1.716x+36x=3.5+212x 1.7-\frac{1}{6}x+\frac{3}{6}x=3.5+\frac{2}{12}x

2

Step-by-step solution

To solve this problem, we will perform the following steps:

  • Step 1: Combine like terms on each side of the equation.
  • Step 2: Simplify the equation by performing arithmetic operations.
  • Step 3: Isolate the variable x x by using inverse operations to solve the equation.

Now, let's work through each step:

We start with the original equation:
1.716x+36x=3.5+212x 1.7 - \frac{1}{6}x + \frac{3}{6}x = 3.5 + \frac{2}{12}x

Step 1: Simplify both sides by combining like terms.
On the left side, combine the terms with x x :
36x16x=26x=13x \frac{3}{6}x - \frac{1}{6}x = \frac{2}{6}x = \frac{1}{3}x The equation becomes:
1.7+13x=3.5+212x 1.7 + \frac{1}{3}x = 3.5 + \frac{2}{12}x

Notice that 212x \frac{2}{12}x can be simplified to 16x \frac{1}{6}x

The equation is now:
1.7+13x=3.5+16x 1.7 + \frac{1}{3}x = 3.5 + \frac{1}{6}x

Step 2: To remove the fractions, find a common denominator for the coefficients of x x , which is 6. Convert 13x \frac{1}{3}x to a fraction with 6 as the denominator:
13x=26x \frac{1}{3}x = \frac{2}{6}x Substitute in the equation:
1.7+26x=3.5+16x 1.7 + \frac{2}{6}x = 3.5 + \frac{1}{6}x

Subtract 16x \frac{1}{6}x from both sides:
1.7+26x16x=3.5 1.7 + \frac{2}{6}x - \frac{1}{6}x = 3.5 This simplifies to:
1.7+16x=3.5 1.7 + \frac{1}{6}x = 3.5

Subtract 1.7 from both sides to isolate the term with x x :
16x=3.51.7 \frac{1}{6}x = 3.5 - 1.7 16x=1.8 \frac{1}{6}x = 1.8

Step 3: Solve for x x by multiplying both sides by 6 to clear the fraction:
x=1.8×6 x = 1.8 \times 6 Calculate the multiplication:
x=10.8 x = 10.8

Thus, the solution to the problem is x=10.8 x = 10.8 .

3

Final Answer

10.8 10.8

Key Points to Remember

Essential concepts to master this topic
  • Simplification: Combine like terms first before isolating the variable
  • Technique: Convert 36x16x=26x=13x \frac{3}{6}x - \frac{1}{6}x = \frac{2}{6}x = \frac{1}{3}x
  • Verification: Substitute x = 10.8: 1.7+13(10.8)=5.3 1.7 + \frac{1}{3}(10.8) = 5.3 and 3.5+16(10.8)=5.3 3.5 + \frac{1}{6}(10.8) = 5.3

Common Mistakes

Avoid these frequent errors
  • Not combining like terms before solving
    Don't leave 16x+36x -\frac{1}{6}x + \frac{3}{6}x separate = more complicated solving! This creates unnecessary fraction work and increases error chances. Always combine like terms first: 36x16x=26x=13x \frac{3}{6}x - \frac{1}{6}x = \frac{2}{6}x = \frac{1}{3}x .

Practice Quiz

Test your knowledge with interactive questions

Solve for X:

\( 6 - x = 10 - 2 \)

FAQ

Everything you need to know about this question

Why do I need to combine the x terms on the left side first?

+

Combining like terms simplifies your equation! Instead of working with 16x+36x -\frac{1}{6}x + \frac{3}{6}x , you get the simpler 13x \frac{1}{3}x . This reduces mistakes and makes solving easier.

How do I subtract fractions with the same denominator?

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When fractions have the same denominator, just subtract the numerators: 36x16x=316x=26x \frac{3}{6}x - \frac{1}{6}x = \frac{3-1}{6}x = \frac{2}{6}x . Then simplify by dividing both numerator and denominator by their GCD.

Can I convert everything to decimals instead?

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You could, but fractions like 16 \frac{1}{6} become repeating decimals (0.1666...), which are harder to work with exactly. Keep fractions when they're already given!

What if I get confused by mixing decimals and fractions?

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Take it step by step! First combine all the x terms, then all the constant terms. Work with one type at a time: keep decimals as decimals (like 1.7 and 3.5) and fractions as fractions.

How do I check if x = 10.8 is really correct?

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Substitute back into the original equation: Left side = 1.716(10.8)+36(10.8)=1.7+1.8+1.8=5.3 1.7 - \frac{1}{6}(10.8) + \frac{3}{6}(10.8) = 1.7 + 1.8 + 1.8 = 5.3 . Right side = 3.5+212(10.8)=3.5+1.8=5.3 3.5 + \frac{2}{12}(10.8) = 3.5 + 1.8 = 5.3 . Both equal 5.3! ✓

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