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

\( x+x=8 \)

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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