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Subtract 21/8 from 7/15

1st number: 7/15, 2nd number: 2 5/8

7/15 - 21/8 is -259/120.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 8 is 120
  2. For the 1st fraction, since 15 × 8 = 120,
    7/15 = 7 × 8/15 × 8 = 56/120
  3. Likewise, for the 2nd fraction, since 8 × 15 = 120,
    21/8 = 21 × 15/8 × 15 = 315/120
  4. Subtract the two fractions:
    56/120 - 315/120 = 56 - 315/120 = -259/120

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