Solve for X in -x + 8/3x + 5 = 1-x: Linear Equation with Fractions

Linear Equations with Mixed Terms

Solve for x:

x+813x+5=1x -x+8\cdot\frac{1}{3}x+5=1-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 only the unknown X is on one side
00:27 Group terms
00:36 Multiply by the reciprocal fraction to isolate X
00:47 Simplify what we can
00:54 Factor 8 into 2 and 4
01:00 Simplify what we can
01:05 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:

x+813x+5=1x -x+8\cdot\frac{1}{3}x+5=1-x

2

Step-by-step solution

To solve this linear equation, we will follow these steps:

  • Simplify the left-hand side by expanding and combining like terms.
  • Isolate xx on one side of the equation.
  • Solve for xx.

Let's perform these steps:

We start with the equation: x+813x+5=1x -x + 8 \cdot \frac{1}{3}x + 5 = 1 - x .

First, simplify the term 813x8 \cdot \frac{1}{3}x to 83x\frac{8}{3}x.

The equation becomes:

x+83x+5=1x-x + \frac{8}{3}x + 5 = 1 - x.

Combine the like terms x-x and 83x\frac{8}{3}x:

(1+83)x=83x33x=53x\left(-1 + \frac{8}{3}\right)x = \frac{8}{3}x - \frac{3}{3}x = \frac{5}{3}x.

The equation simplifies to:

53x+5=1x\frac{5}{3}x + 5 = 1 - x.

Add xx to both sides to eliminate xx on the right-hand side:

53x+x+5=1\frac{5}{3}x + x + 5 = 1.

Convert xx to a fraction: x=33xx = \frac{3}{3}x, so:

(53+33)x+5=1\left(\frac{5}{3} + \frac{3}{3}\right)x + 5 = 1.

This simplifies to:

83x+5=1\frac{8}{3}x + 5 = 1.

Subtract 55 from both sides to isolate terms involving xx:

83x=15\frac{8}{3}x = 1 - 5, which simplifies to:

83x=4\frac{8}{3}x = -4.

Isolate xx by multiplying both sides by the reciprocal of 83\frac{8}{3}:

x=4×38x = -4 \times \frac{3}{8}.

Calculate the value:

x=128x = -\frac{12}{8}.

Simplify the fraction:

x=32x = -\frac{3}{2}.

Therefore, the solution to the equation is x=32 x = -\frac{3}{2} .

3

Final Answer

32 -\frac{3}{2}

Key Points to Remember

Essential concepts to master this topic
  • Simplification: Combine like terms first before moving variables between sides
  • Technique: Convert x+83x=53x -x + \frac{8}{3}x = \frac{5}{3}x by finding common denominator
  • Check: Substitute x=32 x = -\frac{3}{2} back: both sides equal 1 ✓

Common Mistakes

Avoid these frequent errors
  • Moving terms before simplifying the left side
    Don't move variables to the right side before combining x+83x -x + \frac{8}{3}x = wrong coefficients! This creates confusion and leads to calculation errors. Always combine like terms on each side first, then move variables.

Practice Quiz

Test your knowledge with interactive questions

\( 5x=0 \)

FAQ

Everything you need to know about this question

How do I combine -x and (8/3)x when they have different denominators?

+

Convert -x to a fraction with denominator 3: x=33x -x = -\frac{3}{3}x . Then: 33x+83x=53x -\frac{3}{3}x + \frac{8}{3}x = \frac{5}{3}x

Why do I get a negative answer? Did I make a mistake?

+

Negative answers are completely normal! In this problem, x=32 x = -\frac{3}{2} is correct. Always check by substituting back into the original equation.

Can I multiply everything by 3 to clear the fraction first?

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Yes! Multiplying the entire equation by 3 eliminates fractions: 3x+8x+15=33x -3x + 8x + 15 = 3 - 3x . This makes the arithmetic easier for some students.

What's the difference between 8·(1/3)x and 8/(3x)?

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Huge difference! 813x=8x3 8 \cdot \frac{1}{3}x = \frac{8x}{3} , but 83x \frac{8}{3x} has x in the denominator. Always use parentheses to clarify: 8(13x) 8 \cdot (\frac{1}{3}x)

How do I check my answer when there are fractions involved?

+

Substitute x=32 x = -\frac{3}{2} into the original equation and calculate each side carefully. Both sides should equal the same number when you're done.

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