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Subtract 15/6 from 8/21

1st number: 8/21, 2nd number: 2 3/6

8/21 - 15/6 is -89/42.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 6 is 42
  2. For the 1st fraction, since 21 × 2 = 42,
    8/21 = 8 × 2/21 × 2 = 16/42
  3. Likewise, for the 2nd fraction, since 6 × 7 = 42,
    15/6 = 15 × 7/6 × 7 = 105/42
  4. Subtract the two fractions:
    16/42 - 105/42 = 16 - 105/42 = -89/42

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