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Subtract 9/28 from 5/42

5/42 - 9/28 is -17/84.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 28 is 84
  2. For the 1st fraction, since 42 × 2 = 84,
    5/42 = 5 × 2/42 × 2 = 10/84
  3. Likewise, for the 2nd fraction, since 28 × 3 = 84,
    9/28 = 9 × 3/28 × 3 = 27/84
  4. Subtract the two fractions:
    10/84 - 27/84 = 10 - 27/84 = -17/84

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