Solve for X: Finding the Value in (1/4)x - (2/3)x + (1/8)x = 5

Solve for X:

14x23x+18x=5 \frac{1}{4}x-\frac{2}{3}x+\frac{1}{8}x=5

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:04 We want to isolate the unknown X
00:07 Find the common denominator
00:13 Isolate the unknown X
00:26 Division by a fraction is multiplication by its reciprocal
00:32 Make sure to multiply numerator by numerator and denominator by denominator
00:45 And this is the solution to the question

Step-by-step written solution

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1

Understand the problem

Solve for X:

14x23x+18x=5 \frac{1}{4}x-\frac{2}{3}x+\frac{1}{8}x=5

2

Step-by-step solution

Solve the equation by following these steps:

  • Step 1: Find the least common multiple (LCM) of the denominators 44, 33, and 88. The LCM is 2424.
  • Step 2: Rewrite each term so that the denominator is 2424.
    14x=624x\frac{1}{4}x = \frac{6}{24}x
    23x=1624x-\frac{2}{3}x = -\frac{16}{24}x
    18x=324x\frac{1}{8}x = \frac{3}{24}x
  • Step 3: Combine the terms over the common denominator:
    (6241624+324)x=5\left(\frac{6}{24} - \frac{16}{24} + \frac{3}{24}\right)x = 5
  • Step 4: Simplify the left side:
    616+324x=5\frac{6 - 16 + 3}{24}x = 5
    724x=5 \frac{-7}{24}x = 5
  • Step 5: Solve for xx by isolating it:
    Multiply both sides by 24/7-24/7:
    x=5×(247)x = 5 \times \left(-\frac{24}{7}\right)
  • Step 6: Perform the multiplication:
    x=1207x = -\frac{120}{7}
  • Step 7: Convert the improper fraction to a mixed number:
    The mixed number is 1717-17\frac{1}{7}.

The solution to the equation is x=1717 x = -17\frac{1}{7} .

3

Final Answer

1717 -17\frac{1}{7}

Practice Quiz

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\( x+7=14 \)

\( x=\text{?} \)

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