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Subtract 45/12 from 5/42

1st number: 5/42, 2nd number: 3 9/12

5/42 - 45/12 is -305/84.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 12 is 84
  2. For the 1st fraction, since 42 × 2 = 84,
    5/42 = 5 × 2/42 × 2 = 10/84
  3. Likewise, for the 2nd fraction, since 12 × 7 = 84,
    45/12 = 45 × 7/12 × 7 = 315/84
  4. Subtract the two fractions:
    10/84 - 315/84 = 10 - 315/84 = -305/84

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