Solve the Fraction Equation: Finding X in 1/8 - 4/16 + 15/16x = 3/4x - 2/8x + 3/8

Linear Equations with Mixed Denominators

Solve for X:


18416+1516x=34x28x+38 \frac{1}{8}-\frac{4}{16}+\frac{15}{16}x=\frac{3}{4}x-\frac{2}{8}x+\frac{3}{8}

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find X
00:05 Multiply by the common denominator
00:50 Solve each multiplication separately
01:02 Collect terms
01:07 Arrange the equation so that only X is on one side
01:31 Isolate X
01:39 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:


18416+1516x=34x28x+38 \frac{1}{8}-\frac{4}{16}+\frac{15}{16}x=\frac{3}{4}x-\frac{2}{8}x+\frac{3}{8}

2

Step-by-step solution

To solve this problem, we'll follow these steps:

  • Step 1: Simplify both sides of the equation by combining like terms.
  • Step 2: Solve for x x .

Now, let's work through each step:

Step 1: Simplify the left-hand side:
18416+1516x=1814+1516x \frac{1}{8} - \frac{4}{16} + \frac{15}{16}x = \frac{1}{8} - \frac{1}{4} + \frac{15}{16}x .
Convert 14\frac{1}{4} to 28\frac{2}{8}, the same denominator with 18\frac{1}{8}:
1828+1516x=18+1516x \frac{1}{8} - \frac{2}{8} + \frac{15}{16}x = -\frac{1}{8} + \frac{15}{16}x .

Simplify the right-hand side:
34x28x+38=34x14x+38 \frac{3}{4}x - \frac{2}{8}x + \frac{3}{8} = \frac{3}{4}x - \frac{1}{4}x + \frac{3}{8} .
Convert both terms with x x to a common denominator (i.e., 4/4 of x x terms):
24x+38=12x+38 \frac{2}{4}x + \frac{3}{8} = \frac{1}{2}x + \frac{3}{8} .

Step 2: Equate the simplified expressions:
18+1516x=12x+38 -\frac{1}{8} + \frac{15}{16}x = \frac{1}{2}x + \frac{3}{8} .

Subtract 12x\frac{1}{2}x from both sides:
18+1516x12x=38-\frac{1}{8} + \frac{15}{16}x - \frac{1}{2}x = \frac{3}{8} .
Convert 12x\frac{1}{2}x to 816x\frac{8}{16}x and 1516x816x=716x\frac{15}{16}x - \frac{8}{16}x = \frac{7}{16}x .
18+716x=38-\frac{1}{8} + \frac{7}{16}x = \frac{3}{8} .

Add 18\frac{1}{8} to both sides:
716x=38+18=48=12\frac{7}{16}x = \frac{3}{8} + \frac{1}{8} = \frac{4}{8} = \frac{1}{2} .

Solve for x x by multiplying both sides by the reciprocal of 716\frac{7}{16}:
x=1/2×167=1614=87 x = \frac{1/2 \times 16}{7} = \frac{16}{14} = \frac{8}{7} .
Checking the choice that matches, the solution is 1614 \frac{16}{14} .

Therefore, the solution to the problem is x=1614 x = \frac{16}{14} .

3

Final Answer

1614 \frac{16}{14}

Key Points to Remember

Essential concepts to master this topic
  • Simplification: Convert all fractions to common denominators before combining terms
  • Technique: Change 416 \frac{4}{16} to 14 \frac{1}{4} , then 28 \frac{2}{8} for easier subtraction
  • Check: Substitute x=1614 x = \frac{16}{14} back into original equation to verify both sides equal ✓

Common Mistakes

Avoid these frequent errors
  • Forgetting to simplify fractions before combining
    Don't leave 416 \frac{4}{16} as is when subtracting from 18 \frac{1}{8} = impossible to combine directly! This creates confusion and wrong calculations. Always simplify fractions first: 416=14 \frac{4}{16} = \frac{1}{4} , then convert to matching denominators.

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 fractions like 4/16 first?

+

Simplified fractions are easier to work with! When you change 416 \frac{4}{16} to 14 \frac{1}{4} , it's much clearer what common denominator to use with 18 \frac{1}{8} .

How do I combine x terms with different denominators?

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Find a common denominator for the coefficients! For 1516x \frac{15}{16}x and 12x \frac{1}{2}x , convert 12x \frac{1}{2}x to 816x \frac{8}{16}x , then subtract: 1516x816x=716x \frac{15}{16}x - \frac{8}{16}x = \frac{7}{16}x .

Should I clear all fractions at the beginning?

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Not necessarily! In this problem, it's often easier to combine like terms first, then clear fractions. This reduces the numbers you're working with and prevents errors.

My final answer looks messy - is 16/14 really right?

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Yes! 1614 \frac{16}{14} can be simplified to 87 \frac{8}{7} if needed, but both forms are correct. Always verify by substituting back into the original equation.

What if I make a sign error with the fractions?

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Track your signs carefully! Use parentheses when needed: 1828=18 \frac{1}{8} - \frac{2}{8} = -\frac{1}{8} . A positive minus a larger positive gives a negative result.

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