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Subtract 84/9 from 40/21

1st number: 1 19/21, 2nd number: 9 3/9

40/21 - 84/9 is -52/7.

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,
    40/21 = 40 × 3/21 × 3 = 120/63
  3. Likewise, for the 2nd fraction, since 9 × 7 = 63,
    84/9 = 84 × 7/9 × 7 = 588/63
  4. Subtract the two fractions:
    120/63 - 588/63 = 120 - 588/63 = -468/63
  5. After reducing the fraction, the answer is -52/7

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