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Subtract 15/54 from 25/42

25/42 - 15/54 is 20/63.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 54 is 378
  2. For the 1st fraction, since 42 × 9 = 378,
    25/42 = 25 × 9/42 × 9 = 225/378
  3. Likewise, for the 2nd fraction, since 54 × 7 = 378,
    15/54 = 15 × 7/54 × 7 = 105/378
  4. Subtract the two fractions:
    225/378 - 105/378 = 225 - 105/378 = 120/378
  5. After reducing the fraction, the answer is 20/63

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