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Subtract 20/7 from 15/12

1st number: 1 3/12, 2nd number: 2 6/7

15/12 - 20/7 is -45/28.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 12 and 7 is 84
  2. For the 1st fraction, since 12 × 7 = 84,
    15/12 = 15 × 7/12 × 7 = 105/84
  3. Likewise, for the 2nd fraction, since 7 × 12 = 84,
    20/7 = 20 × 12/7 × 12 = 240/84
  4. Subtract the two fractions:
    105/84 - 240/84 = 105 - 240/84 = -135/84
  5. After reducing the fraction, the answer is -45/28

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