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Subtract 81/21 from 4/2

1st number: 2 0/2, 2nd number: 3 18/21

4/2 - 81/21 is -13/7.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 2 and 21 is 42
  2. For the 1st fraction, since 2 × 21 = 42,
    4/2 = 4 × 21/2 × 21 = 84/42
  3. Likewise, for the 2nd fraction, since 21 × 2 = 42,
    81/21 = 81 × 2/21 × 2 = 162/42
  4. Subtract the two fractions:
    84/42 - 162/42 = 84 - 162/42 = -78/42
  5. After reducing the fraction, the answer is -13/7

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