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Subtract 63/72 from 21/50

21/50 - 63/72 is -91/200.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 50 and 72 is 1800
  2. For the 1st fraction, since 50 × 36 = 1800,
    21/50 = 21 × 36/50 × 36 = 756/1800
  3. Likewise, for the 2nd fraction, since 72 × 25 = 1800,
    63/72 = 63 × 25/72 × 25 = 1575/1800
  4. Subtract the two fractions:
    756/1800 - 1575/1800 = 756 - 1575/1800 = -819/1800
  5. After reducing the fraction, the answer is -91/200

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