Solve the Fraction Equation: 1/8(1/2-x) = 1/4(x-1/4)

Linear Equations with Fractional Coefficients

Solve for X:

18(12x)=14(x14) \frac{1}{8}(\frac{1}{2}-x)=\frac{1}{4}(x-\frac{1}{4})

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 Multiply by the common denominator and multiply accordingly
00:19 Open parentheses properly, multiply by each factor
00:37 Break down 4 into factors 2 and 2
00:40 Reduce what's possible, and substitute
00:44 Arrange the equation so that one side has only the unknown X
01:01 Combine like terms
01:04 Isolate X
01:07 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Solve for X:

18(12x)=14(x14) \frac{1}{8}(\frac{1}{2}-x)=\frac{1}{4}(x-\frac{1}{4})

2

Step-by-step solution

To solve the equation 18(12x)=14(x14) \frac{1}{8}(\frac{1}{2} - x) = \frac{1}{4}(x - \frac{1}{4}) , we will first distribute the fractions:

  • Distribute 18\frac{1}{8} through (12x)(\frac{1}{2} - x):
  • 181218x=11618x\frac{1}{8} \cdot \frac{1}{2} - \frac{1}{8}x = \frac{1}{16} - \frac{1}{8}x
  • Distribute 14\frac{1}{4} through (x14)(x - \frac{1}{4}):
  • 14x1414=14x116\frac{1}{4}x - \frac{1}{4} \cdot \frac{1}{4} = \frac{1}{4}x - \frac{1}{16}

With distributed terms, the equation becomes:

11618x=14x116\frac{1}{16} - \frac{1}{8}x = \frac{1}{4}x - \frac{1}{16}.

We will eliminate the fractions by multiplying the entire equation by 16, the least common multiple of the denominators 8 and 4, to eliminate fractions:

  • 16×(11618x)=16×(14x116)16 \times (\frac{1}{16} - \frac{1}{8}x) = 16 \times (\frac{1}{4}x - \frac{1}{16})
  • This simplifies to: 12x=4x11 - 2x = 4x - 1.

Now, we'll solve the equation:

1. Add 2x2x to both sides to gather xx terms on one side:

1=6x11 = 6x - 1

2. Add 11 to both sides:

2=6x2 = 6x

3. Divide both sides by 66 to isolate xx:

x=26=13x = \frac{2}{6} = \frac{1}{3}

Thus, the solution to the equation is x=13x = \frac{1}{3}.

3

Final Answer

13 \frac{1}{3}

Key Points to Remember

Essential concepts to master this topic
  • Rule: Multiply entire equation by LCD to eliminate all fractions
  • Technique: LCD of 8, 4, 16 is 16, so multiply: 16(1/16 - x/8) = 16(x/4 - 1/16)
  • Check: Substitute x = 1/3: 1/8(1/2 - 1/3) = 1/4(1/3 - 1/4) gives 1/48 = 1/48 ✓

Common Mistakes

Avoid these frequent errors
  • Not distributing multiplication across all terms
    Don't multiply 16 × 1/16 but forget 16 × (-x/8) = equation becomes 1 - x/8 instead of 1 - 2x! This leaves fractions and creates wrong coefficients. Always multiply the LCD through every single term on both sides.

Practice Quiz

Test your knowledge with interactive questions

Solve for x:

\( 2(4-x)=8 \)

FAQ

Everything you need to know about this question

Why multiply by 16 instead of just clearing one fraction at a time?

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Multiplying by the LCD (16) clears all fractions in one step! This prevents errors and keeps the equation simpler than clearing fractions one by one.

How do I find the LCD when denominators are 8, 4, and 16?

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List multiples: 8 (8,16,24...), 4 (4,8,12,16...), 16 (16,32...). The smallest common multiple is 16, so that's your LCD.

What if I get confused with the negative signs when distributing?

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Be extra careful with negatives! When you have 18(12x) \frac{1}{8}(\frac{1}{2} - x) , remember the negative stays with the x: 116x8 \frac{1}{16} - \frac{x}{8}

Can I solve this without clearing fractions?

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Yes, but it's much harder! You'd have to work with fractions throughout. Clearing fractions first makes the algebra much simpler and reduces calculation errors.

How do I check if x = 1/3 is really correct?

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Substitute into the original equation: 18(1213)=14(1314) \frac{1}{8}(\frac{1}{2} - \frac{1}{3}) = \frac{1}{4}(\frac{1}{3} - \frac{1}{4}) . Both sides equal 148 \frac{1}{48} , so it's correct!

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