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Subtract 21/35 from 7/15

7/15 - 21/35 is -2/15.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 35 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 35 × 3 = 105,
    21/35 = 21 × 3/35 × 3 = 63/105
  4. Subtract the two fractions:
    49/105 - 63/105 = 49 - 63/105 = -14/105
  5. After reducing the fraction, the answer is -2/15

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