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Subtract 28/20 from 35/42

1st number: 35/42, 2nd number: 1 8/20

35/42 - 28/20 is -17/30.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 20 is 420
  2. For the 1st fraction, since 42 × 10 = 420,
    35/42 = 35 × 10/42 × 10 = 350/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    28/20 = 28 × 21/20 × 21 = 588/420
  4. Subtract the two fractions:
    350/420 - 588/420 = 350 - 588/420 = -238/420
  5. After reducing the fraction, the answer is -17/30

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