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Subtract 21/63 from 15/75

15/75 - 21/63 is -2/15.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 75 and 63 is 1575
  2. For the 1st fraction, since 75 × 21 = 1575,
    15/75 = 15 × 21/75 × 21 = 315/1575
  3. Likewise, for the 2nd fraction, since 63 × 25 = 1575,
    21/63 = 21 × 25/63 × 25 = 525/1575
  4. Subtract the two fractions:
    315/1575 - 525/1575 = 315 - 525/1575 = -210/1575
  5. After reducing the fraction, the answer is -2/15

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