Solve the Fraction Equation: 1/4x - 3 = 5 + 3/4x

Linear Equations with Fractional Coefficients

Solve for X:


14x3=5+34x \frac{1}{4}x-3=5+\frac{3}{4}x

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find X
00:04 Arrange the equation so that one side has only the unknown X
00:26 Collect like terms
00:30 Isolate X by multiplying by the reciprocal
00:43 Multiply by the numerator
00:50 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:


14x3=5+34x \frac{1}{4}x-3=5+\frac{3}{4}x

2

Step-by-step solution

To solve the equation 14x3=5+34x\frac{1}{4}x - 3 = 5 + \frac{3}{4}x, follow these steps:

  • Step 1: Eliminate 34x\frac{3}{4}x from the right side by subtracting 34x\frac{3}{4}x from both sides.

This gives:

14x34x3=5\frac{1}{4}x - \frac{3}{4}x - 3 = 5

  • Step 2: Combine the like terms xx on the left side.

This simplifies to:

24x3=5-\frac{2}{4}x - 3 = 5

or more simply,

12x3=5-\frac{1}{2}x - 3 = 5

  • Step 3: Add 3 to both sides to move the constant term.

This results in:

12x=8-\frac{1}{2}x = 8

  • Step 4: Solve for xx by multiplying both sides by 2-2 (the reciprocal of 12-\frac{1}{2}).

This yields:

x=16x = -16

Therefore, the solution to the equation is x=16 x = -16 .

3

Final Answer

16 -16

Key Points to Remember

Essential concepts to master this topic
  • Variable Collection: Move all x-terms to one side of equation
  • Technique: Subtract 34x \frac{3}{4}x from both sides to combine coefficients
  • Check: Substitute x = -16: 14(16)3=43=7 \frac{1}{4}(-16) - 3 = -4 - 3 = -7 and 5+34(16)=512=7 5 + \frac{3}{4}(-16) = 5 - 12 = -7

Common Mistakes

Avoid these frequent errors
  • Adding fractions incorrectly when combining like terms
    Don't add 14x34x \frac{1}{4}x - \frac{3}{4}x as 28x \frac{-2}{8}x = wrong coefficient! This gives the wrong final answer. Always use the same denominator: 14x34x=134x=24x=12x \frac{1}{4}x - \frac{3}{4}x = \frac{1-3}{4}x = \frac{-2}{4}x = -\frac{1}{2}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 subtract the same variable term from both sides?

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Subtracting 34x \frac{3}{4}x from both sides keeps the equation balanced while collecting all x-terms on one side. This is the key to isolating the variable!

How do I subtract fractions with the same denominator?

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When fractions have the same denominator, just subtract the numerators: 1434=134=24=12 \frac{1}{4} - \frac{3}{4} = \frac{1-3}{4} = \frac{-2}{4} = -\frac{1}{2} . Keep the denominator the same!

What's the easiest way to multiply by -2?

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To solve 12x=8 -\frac{1}{2}x = 8 , multiply both sides by -2: x=8×(2)=16 x = 8 \times (-2) = -16 . Remember that multiplying by -2 flips the sign!

Can I move the constant first instead of the variable terms?

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Yes! You could add 3 to both sides first, then subtract the variable terms. Either order works - just be consistent and keep the equation balanced at each step.

Why is my answer negative?

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Negative answers are completely normal! In this problem, the coefficient of x becomes negative (12 -\frac{1}{2} ), and we're solving 12x=8 -\frac{1}{2}x = 8 , so x must be negative to make this true.

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