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Subtract 15/18 from 5/42

5/42 - 15/18 is -5/7.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 18 is 126
  2. For the 1st fraction, since 42 × 3 = 126,
    5/42 = 5 × 3/42 × 3 = 15/126
  3. Likewise, for the 2nd fraction, since 18 × 7 = 126,
    15/18 = 15 × 7/18 × 7 = 105/126
  4. Subtract the two fractions:
    15/126 - 105/126 = 15 - 105/126 = -90/126
  5. After reducing the fraction, the answer is -5/7

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