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Subtract 40/42 from 15/75

15/75 - 40/42 is -79/105.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 75 and 42 is 1050
  2. For the 1st fraction, since 75 × 14 = 1050,
    15/75 = 15 × 14/75 × 14 = 210/1050
  3. Likewise, for the 2nd fraction, since 42 × 25 = 1050,
    40/42 = 40 × 25/42 × 25 = 1000/1050
  4. Subtract the two fractions:
    210/1050 - 1000/1050 = 210 - 1000/1050 = -790/1050
  5. After reducing the fraction, the answer is -79/105

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