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Subtract 7/18 from 15/42

15/42 - 7/18 is -2/63.

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,
    15/42 = 15 × 3/42 × 3 = 45/126
  3. Likewise, for the 2nd fraction, since 18 × 7 = 126,
    7/18 = 7 × 7/18 × 7 = 49/126
  4. Subtract the two fractions:
    45/126 - 49/126 = 45 - 49/126 = -4/126
  5. After reducing the fraction, the answer is -2/63

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