Solve the Linear Equation: Break Down -1/2(1/4x + 1/6) = 1/4(1/2x + 1/3)

Linear Equations with Nested Fraction Distribution

Solve for X:

12(14x+16)=14(12x+13) -\frac{1}{2}(\frac{1}{4}x+\frac{1}{6})=\frac{1}{4}(\frac{1}{2}x+\frac{1}{3})

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:04 Open brackets properly, multiply by each factor
00:23 Arrange the equation so that X is isolated on one side
00:51 Collect like terms
00:57 Isolate X
01:07 Simplify what's possible
01:11 Factor 8 into 4 and 2
01:16 Factor 12 into 4 and 3
01:19 Simplify what's possible, and substitute
01:23 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:

12(14x+16)=14(12x+13) -\frac{1}{2}(\frac{1}{4}x+\frac{1}{6})=\frac{1}{4}(\frac{1}{2}x+\frac{1}{3})

2

Step-by-step solution

To solve the equation 12(14x+16)=14(12x+13) -\frac{1}{2}\left(\frac{1}{4}x + \frac{1}{6}\right) = \frac{1}{4}\left(\frac{1}{2}x + \frac{1}{3}\right) , follow these steps:

  • Step 1: Distribute the Factors
    Distribute 12-\frac{1}{2} on the left-hand side:
    12×14x=18x-\frac{1}{2} \times \frac{1}{4}x = -\frac{1}{8}x and 12×16=112-\frac{1}{2} \times \frac{1}{6} = -\frac{1}{12}
    This gives us: 18x112 -\frac{1}{8}x - \frac{1}{12} .
  • Step 2: Do the same for the right-hand side, multiplying by 14\frac{1}{4}:
    14×12x=18x\frac{1}{4} \times \frac{1}{2}x = \frac{1}{8}x and 14×13=112\frac{1}{4} \times \frac{1}{3} = \frac{1}{12}
    This results in: 18x+112\frac{1}{8}x + \frac{1}{12}.
  • Step 3: Combine Results
    We equate the distributed expressions:
    18x112=18x+112-\frac{1}{8}x - \frac{1}{12} = \frac{1}{8}x + \frac{1}{12}.
  • Step 4: Clear the Fractions
    Multiply every term by the LCM of 8 and 12, which is 24:
    24(18x)24(112)=24(18x)+24(112)24\left(-\frac{1}{8}x\right) - 24\left(\frac{1}{12}\right) = 24\left(\frac{1}{8}x\right) + 24\left(\frac{1}{12}\right)
    This simplifies to: 3x2=3x+2-3x - 2 = 3x + 2.
  • Step 5: Solve the Equation
    Move all xx terms to one side and constants to the other:
    3x3x=2+2-3x - 3x = 2 + 2
    6x=4-6x = 4
  • Step 6: Solve for xx
    Divide both sides by -6:
    x=46=23x = \frac{4}{-6} = -\frac{2}{3}

Therefore, the solution to the problem is x=23 x = -\frac{2}{3} , which corresponds to Choice 1.

3

Final Answer

23 -\frac{2}{3}

Key Points to Remember

Essential concepts to master this topic
  • Distribution Rule: Apply distributive property to both sides before clearing fractions
  • Technique: Multiply by LCD 24: 18x -\frac{1}{8}x becomes 3x -3x
  • Check: Substitute x=23 x = -\frac{2}{3} : both sides equal 16 -\frac{1}{6}

Common Mistakes

Avoid these frequent errors
  • Clearing fractions before distributing
    Don't multiply by LCD first then distribute = wrong coefficients! This changes the original equation structure and gives incorrect results. Always distribute the outer fractions first, then find LCD to clear all remaining fractions.

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 do I distribute first instead of clearing fractions right away?

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You need to distribute first to see all the individual terms! If you clear fractions before distributing, you'll miss some terms and get the wrong equation structure.

How do I find the LCD when there are so many fractions?

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Look at all denominators after distributing: 8 and 12. Find their least common multiple: LCM(8,12)=24 \text{LCM}(8,12) = 24 . This clears all fractions at once!

What if I get confused with all the negative signs?

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Take it one step at a time! When distributing 12 -\frac{1}{2} , remember that negative times positive gives negative, and negative times negative gives positive.

Is there an easier way to solve this problem?

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This is the systematic way! While it looks long, following these steps prevents errors. Shortcuts often lead to sign mistakes or missing terms in complex fraction problems.

How do I check my answer with such a complicated equation?

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Substitute x=23 x = -\frac{2}{3} into the original equation. Calculate each side separately: both should equal 16 -\frac{1}{6} . If they match, you're correct!

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