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Subtract 9/7 from 21/12

1st number: 1 9/12, 2nd number: 1 2/7

21/12 - 9/7 is 13/28.

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,
    21/12 = 21 × 7/12 × 7 = 147/84
  3. Likewise, for the 2nd fraction, since 7 × 12 = 84,
    9/7 = 9 × 12/7 × 12 = 108/84
  4. Subtract the two fractions:
    147/84 - 108/84 = 147 - 108/84 = 39/84
  5. After reducing the fraction, the answer is 13/28

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