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Subtract 21/7 from 7/15

1st number: 7/15, 2nd number: 3 0/7

7/15 - 21/7 is -38/15.

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,
    7/15 = 7 × 7/15 × 7 = 49/105
  3. Likewise, for the 2nd fraction, since 7 × 15 = 105,
    21/7 = 21 × 15/7 × 15 = 315/105
  4. Subtract the two fractions:
    49/105 - 315/105 = 49 - 315/105 = -266/105
  5. After reducing the fraction, the answer is -38/15

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