Master the Equation: Solve 1/8X + 3 = -1/5 + 5/16X

Linear Equations with Fractional Coefficients

Solve for X:

18x+3=15+516x \frac{1}{8}x+3=-\frac{1}{5}+\frac{5}{16}x

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:07 Let's start by finding X.
00:11 First, arrange the equation so that X is all by itself on one side.
00:31 Next, find a common denominator, and multiply each term accordingly.
00:44 Now, collect the like terms together.
00:58 Then, multiply by the reciprocal to get X alone.
01:07 Be sure to multiply the numerators with the numerators and the denominators with the denominators.
01:14 And that's the solution to our problem!

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Solve for X:

18x+3=15+516x \frac{1}{8}x+3=-\frac{1}{5}+\frac{5}{16}x

2

Step-by-step solution

To solve the equation 18x+3=15+516x \frac{1}{8}x + 3 = -\frac{1}{5} + \frac{5}{16}x , we will perform the following steps:

  • Step 1: Clear the fractions
    First, find the least common multiple (LCM) of the denominators 8, 5, and 16. The LCM is 80.
  • Step 2: Eliminate the fractions
    Multiply every term in the equation by 80:
  • 80×18x+80×3=80×(15)+80×516x 80 \times \frac{1}{8}x + 80 \times 3 = 80 \times \left(-\frac{1}{5}\right) + 80 \times \frac{5}{16}x
  • Simplifying, we get:
  • 10x+240=16+25x 10x + 240 = -16 + 25x
  • Step 3: Rearrange and combine like terms
    Subtract 10x 10x from both sides to get the x x terms on one side:
  • 240=16+25x10x 240 = -16 + 25x - 10x
  • Further simplifying, we have:
  • 240=16+15x 240 = -16 + 15x
  • Add 16 to both sides to isolate terms with x x :
  • 240+16=15x 240 + 16 = 15x 256=15x 256 = 15x
  • Step 4: Solve for x x
    Divide both sides by 15:
  • x=25615 x = \frac{256}{15}

Therefore, the solution to the equation is x=25615 x = \frac{256}{15} . The correct choice corresponding to this answer is choice 2.

3

Final Answer

25615 \frac{256}{15}

Key Points to Remember

Essential concepts to master this topic
  • LCD Method: Find common denominator (80) to eliminate all fractions
  • Technique: Multiply every term: 80 × (1/8)x becomes 10x
  • Check: Substitute x = 256/15 back into original equation ✓

Common Mistakes

Avoid these frequent errors
  • Forgetting to multiply constant terms by LCD
    Don't multiply just the fraction terms by 80 and leave 3 unchanged = wrong equation! This creates an imbalanced equation because you're not treating both sides equally. Always multiply every single term in the equation by the LCD.

Practice Quiz

Test your knowledge with interactive questions

\( x+x=8 \)

FAQ

Everything you need to know about this question

Why multiply by 80 instead of a smaller number?

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We need the LCD (Least Common Denominator) of 8, 5, and 16, which is 80. Using 80 clears all fractions in one step, making the algebra much simpler!

How do I find the LCD of 8, 5, and 16?

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List multiples of each: 8 (8, 16, 24, 40, 80...), 5 (5, 10, 15, 20, 80...), 16 (16, 32, 48, 64, 80...). The first common multiple is 80.

Can I solve this without clearing fractions?

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Yes, but it's much harder! You'd have to work with fractions throughout. Clearing fractions first turns this into a simple integer equation: 10x+240=16+25x 10x + 240 = -16 + 25x

Is 256/15 in simplest form?

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Yes! Since 256 and 15 share no common factors (256 = 2⁸, 15 = 3 × 5), the fraction 25615 \frac{256}{15} is already fully simplified.

How do I check my answer?

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Substitute x=25615 x = \frac{256}{15} into the original equation. Calculate both sides separately and verify they're equal. This confirms your solution is correct!

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