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Subtract 12/9 from 5/21

1st number: 5/21, 2nd number: 1 3/9

5/21 - 12/9 is -23/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 9 is 63
  2. For the 1st fraction, since 21 × 3 = 63,
    5/21 = 5 × 3/21 × 3 = 15/63
  3. Likewise, for the 2nd fraction, since 9 × 7 = 63,
    12/9 = 12 × 7/9 × 7 = 84/63
  4. Subtract the two fractions:
    15/63 - 84/63 = 15 - 84/63 = -69/63
  5. After reducing the fraction, the answer is -23/21

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