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Subtract 63/8 from 15/21

1st number: 15/21, 2nd number: 7 7/8

15/21 - 63/8 is -401/56.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 8 is 168
  2. For the 1st fraction, since 21 × 8 = 168,
    15/21 = 15 × 8/21 × 8 = 120/168
  3. Likewise, for the 2nd fraction, since 8 × 21 = 168,
    63/8 = 63 × 21/8 × 21 = 1323/168
  4. Subtract the two fractions:
    120/168 - 1323/168 = 120 - 1323/168 = -1203/168
  5. After reducing the fraction, the answer is -401/56

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