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Subtract 10/18 from 12/42

12/42 - 10/18 is -17/63.

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,
    12/42 = 12 × 3/42 × 3 = 36/126
  3. Likewise, for the 2nd fraction, since 18 × 7 = 126,
    10/18 = 10 × 7/18 × 7 = 70/126
  4. Subtract the two fractions:
    36/126 - 70/126 = 36 - 70/126 = -34/126
  5. After reducing the fraction, the answer is -17/63

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