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Subtract 8/7 from 5/15

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

5/15 - 8/7 is -17/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 7 is 105
  2. For the 1st fraction, since 15 × 7 = 105,
    5/15 = 5 × 7/15 × 7 = 35/105
  3. Likewise, for the 2nd fraction, since 7 × 15 = 105,
    8/7 = 8 × 15/7 × 15 = 120/105
  4. Subtract the two fractions:
    35/105 - 120/105 = 35 - 120/105 = -85/105
  5. After reducing the fraction, the answer is -17/21

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