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Subtract 21/9 from 3/7

1st number: 3/7, 2nd number: 2 3/9

3/7 - 21/9 is -40/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 7 and 9 is 63
  2. For the 1st fraction, since 7 × 9 = 63,
    3/7 = 3 × 9/7 × 9 = 27/63
  3. Likewise, for the 2nd fraction, since 9 × 7 = 63,
    21/9 = 21 × 7/9 × 7 = 147/63
  4. Subtract the two fractions:
    27/63 - 147/63 = 27 - 147/63 = -120/63
  5. After reducing the fraction, the answer is -40/21

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