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Subtract 20/12 from 30/84

1st number: 30/84, 2nd number: 1 8/12

30/84 - 20/12 is -55/42.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 12 is 84
  2. For the 1st fraction, since 84 × 1 = 84,
    30/84 = 30 × 1/84 × 1 = 30/84
  3. Likewise, for the 2nd fraction, since 12 × 7 = 84,
    20/12 = 20 × 7/12 × 7 = 140/84
  4. Subtract the two fractions:
    30/84 - 140/84 = 30 - 140/84 = -110/84
  5. After reducing the fraction, the answer is -55/42

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