Solve the Fraction Equation: Finding X in (1/8)(x-3) + 5x = 1

Linear Equations with Fractional Distribution

Solve for x:

18(x3)+5x=1 \frac{1}{8}(x-3)+5x=1

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find X
00:03 Multiply by the denominator to eliminate the fraction
00:19 Simplify what's possible
00:29 Arrange the equation so that only the unknown X is on one side
00:40 Collect like terms
00:45 Isolate X
00:51 And that's the solution to the problem

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Solve for x:

18(x3)+5x=1 \frac{1}{8}(x-3)+5x=1

2

Step-by-step solution

To solve the given equation, 18(x3)+5x=1\frac{1}{8}(x - 3) + 5x = 1, we will proceed with the following steps:

  • Step 1: Distribute 18\frac{1}{8} across the terms inside the parenthesis.

  • Step 2: Combine like terms to simplify the equation.

  • Step 3: Isolate the variable xx to find its value.

Now, let's work through each step:
Step 1: Distribute 18\frac{1}{8} into the terms inside the parentheses:

18x183=x838 \frac{1}{8} \cdot x - \frac{1}{8} \cdot 3 = \frac{x}{8} - \frac{3}{8}

So the equation becomes:

x838+5x=1 \frac{x}{8} - \frac{3}{8} + 5x = 1

Step 2: Combine like terms. First, combine the terms with xx:

5x+x8=40x8+x8=41x8 5x + \frac{x}{8} = \frac{40x}{8} + \frac{x}{8} = \frac{41x}{8}

Substitute back into the equation:

41x838=1 \frac{41x}{8} - \frac{3}{8} = 1

Step 3: Isolate xx: add 38\frac{3}{8} to both sides:

41x8=1+38 \frac{41x}{8} = 1 + \frac{3}{8} 41x8=88+38=118 \frac{41x}{8} = \frac{8}{8} + \frac{3}{8} = \frac{11}{8}

Multiply both sides by 8 to eliminate the fraction:

41x=11 41x = 11

Finally, divide both sides by 41 to solve for xx:

x=1141 x=\frac{11}{41}

3

Final Answer

1141 \frac{11}{41}

Key Points to Remember

Essential concepts to master this topic
  • Distribution Rule: Multiply 18 \frac{1}{8} by each term inside parentheses
  • Technique: Convert 5x+x8 5x + \frac{x}{8} to common denominator: 40x8+x8=41x8 \frac{40x}{8} + \frac{x}{8} = \frac{41x}{8}
  • Check: Substitute x=1141 x = \frac{11}{41} back into original equation to verify both sides equal 1 ✓

Common Mistakes

Avoid these frequent errors
  • Forgetting to distribute the fraction to all terms
    Don't multiply 18 \frac{1}{8} by only x but forget the -3 = incomplete distribution! This leaves you with x83+5x=1 \frac{x}{8} - 3 + 5x = 1 instead of x838+5x=1 \frac{x}{8} - \frac{3}{8} + 5x = 1 , giving a wrong answer. Always distribute the coefficient to every single term inside the parentheses.

Practice Quiz

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\( x+x=8 \)

FAQ

Everything you need to know about this question

Why do I need to find a common denominator for the x terms?

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You need a common denominator to combine like terms! Since 5x=40x8 5x = \frac{40x}{8} , you can add it to x8 \frac{x}{8} to get 41x8 \frac{41x}{8} .

What if I multiply everything by 8 at the beginning?

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That works too! Multiplying the entire equation by 8 gives you (x3)+40x=8 (x-3) + 40x = 8 , which is easier to solve. Both methods give the same answer.

How do I know if my fraction answer is in simplest form?

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Check if the numerator and denominator share any common factors. Since 11 is prime and doesn't divide 41, 1141 \frac{11}{41} is already simplified!

Why is my answer a fraction when the equation looks simple?

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Fractional answers are completely normal! The fraction 18 \frac{1}{8} in your equation creates fractional coefficients, which often lead to fractional solutions.

Can I convert my fraction to a decimal?

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Yes, but keep the exact fraction form for your final answer. 11410.268 \frac{11}{41} \approx 0.268 , but the fraction is more precise and preferred in algebra.

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