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Subtract 20/63 from 12/54

12/54 - 20/63 is -2/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 54 and 63 is 378
  2. For the 1st fraction, since 54 × 7 = 378,
    12/54 = 12 × 7/54 × 7 = 84/378
  3. Likewise, for the 2nd fraction, since 63 × 6 = 378,
    20/63 = 20 × 6/63 × 6 = 120/378
  4. Subtract the two fractions:
    84/378 - 120/378 = 84 - 120/378 = -36/378
  5. After reducing the fraction, the answer is -2/21

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