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Subtract 45/42 from 20/25

1st number: 20/25, 2nd number: 1 3/42

20/25 - 45/42 is -19/70.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 25 and 42 is 1050
  2. For the 1st fraction, since 25 × 42 = 1050,
    20/25 = 20 × 42/25 × 42 = 840/1050
  3. Likewise, for the 2nd fraction, since 42 × 25 = 1050,
    45/42 = 45 × 25/42 × 25 = 1125/1050
  4. Subtract the two fractions:
    840/1050 - 1125/1050 = 840 - 1125/1050 = -285/1050
  5. After reducing the fraction, the answer is -19/70

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