Solve for X: -7/8x + 1/7 - 1/3 = 2/3 + 5/8x - 1/4x Linear Equation

Linear Equations with Multiple Fractional Terms

Solve for X:

78x+1713=23+58x14x -\frac{7}{8}x+\frac{1}{7}-\frac{1}{3}=\frac{2}{3}+\frac{5}{8}x-\frac{1}{4}x

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find X
00:03 Arrange the equation so that X is isolated on one side
00:31 Simplify what possible
00:42 Combine like terms
00:55 Continue arranging the equation
01:10 Factor 12 into factors 4 and 3, factor 8 into factors 4 and 2
01:28 Combine like terms
01:32 Simplify what possible
01:47 Find the common denominator
02:03 Isolate X by multiplying by the reciprocal
02:14 Make sure to multiply numerator with numerator and denominator with 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:

78x+1713=23+58x14x -\frac{7}{8}x+\frac{1}{7}-\frac{1}{3}=\frac{2}{3}+\frac{5}{8}x-\frac{1}{4}x

2

Step-by-step solution

Let's proceed with solving the equation step-by-step:

Given Equation: 78x+1713=23+58x14x-\frac{7}{8}x + \frac{1}{7} - \frac{1}{3} = \frac{2}{3} + \frac{5}{8}x - \frac{1}{4}x.

Step 1: Combine like terms on the right side of the equation.
On the right: 58x14x=58x28x=38x\frac{5}{8}x - \frac{1}{4}x = \frac{5}{8}x - \frac{2}{8}x = \frac{3}{8}x.

Therefore, the equation becomes:
78x+1713=23+38x-\frac{7}{8}x + \frac{1}{7} - \frac{1}{3} = \frac{2}{3} + \frac{3}{8}x.

Step 2: Move all the terms involving xx to one side and constant terms to the other side:
78x38x=2317+13-\frac{7}{8}x - \frac{3}{8}x = \frac{2}{3} - \frac{1}{7} + \frac{1}{3}.

Combine the terms involving xx:
108x=2317+13-\frac{10}{8}x = \frac{2}{3} - \frac{1}{7} + \frac{1}{3}.

Step 3: Simplify constants on the right side:
Combine constants on the right: 23+13=1\frac{2}{3} + \frac{1}{3} = 1
Thus, 117=7717=671 - \frac{1}{7} = \frac{7}{7} - \frac{1}{7} = \frac{6}{7}.

Now the equation is:
108x=67-\frac{10}{8}x = \frac{6}{7}.

Step 4: Simplify the coefficient of xx:
108=54-\frac{10}{8} = -\frac{5}{4}.
So the equation simplifies to:
54x=67-\frac{5}{4}x = \frac{6}{7}.

Step 5: Solve for xx by multiplying both sides by the reciprocal of 54-\frac{5}{4}:
x=67×(45)x = \frac{6}{7} \times \left(-\frac{4}{5}\right).

Step 6: Calculate the value of xx:
x=2435x = -\frac{24}{35}.

Therefore, the solution to the equation is x=2435x = -\frac{24}{35}.

Given the provided choices, the correct answer is choice 4: 2435 -\frac{24}{35} .

3

Final Answer

2435 -\frac{24}{35}

Key Points to Remember

Essential concepts to master this topic
  • Combine Like Terms: Group x-terms and constants on opposite sides
  • Technique: Convert 58x14x \frac{5}{8}x - \frac{1}{4}x to 38x \frac{3}{8}x using common denominators
  • Check: Substitute x=2435 x = -\frac{24}{35} back into original equation to verify both sides equal ✓

Common Mistakes

Avoid these frequent errors
  • Adding fractions with different denominators directly
    Don't add 58x14x \frac{5}{8}x - \frac{1}{4}x as 44x \frac{4}{4}x = wrong coefficient! This ignores the need for common denominators and leads to incorrect solutions. Always convert to the same denominator first: 58x28x=38x \frac{5}{8}x - \frac{2}{8}x = \frac{3}{8}x .

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 find a common denominator for the x-terms?

+

You can't combine fractions with different denominators directly! Convert 14x \frac{1}{4}x to 28x \frac{2}{8}x first, then subtract: 58x28x=38x \frac{5}{8}x - \frac{2}{8}x = \frac{3}{8}x .

How do I handle the constants with different denominators?

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Find the LCD of all denominators. For 17 \frac{1}{7} , 13 \frac{1}{3} , and 23 \frac{2}{3} , the LCD is 21. Convert each fraction: 321 \frac{3}{21} , 721 \frac{7}{21} , 1421 \frac{14}{21} .

What if I get confused moving terms to different sides?

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Remember the goal: get all x-terms on one side, all constants on the other. When you move a term across the equals sign, change its sign. Keep track by writing each step clearly!

Why is my final answer negative?

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Negative solutions are completely normal! When you divide 67 \frac{6}{7} by 54 -\frac{5}{4} , you get a negative result because you're dividing a positive by a negative number.

How can I check if my answer is correct?

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Substitute x=2435 x = -\frac{24}{35} back into the original equation. Calculate both sides separately - if they're equal, you got it right! This catches any arithmetic errors you might have made.

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