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Subtract 21/7 from 63/42

1st number: 1 21/42, 2nd number: 3 0/7

63/42 - 21/7 is -3/2.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 7 is 42
  2. For the 1st fraction, since 42 × 1 = 42,
    63/42 = 63 × 1/42 × 1 = 63/42
  3. Likewise, for the 2nd fraction, since 7 × 6 = 42,
    21/7 = 21 × 6/7 × 6 = 126/42
  4. Subtract the two fractions:
    63/42 - 126/42 = 63 - 126/42 = -63/42
  5. After reducing the fraction, the answer is -3/2

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