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Subtract 40/84 from 10/42

10/42 - 40/84 is -5/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 84 is 84
  2. For the 1st fraction, since 42 × 2 = 84,
    10/42 = 10 × 2/42 × 2 = 20/84
  3. Likewise, for the 2nd fraction, since 84 × 1 = 84,
    40/84 = 40 × 1/84 × 1 = 40/84
  4. Subtract the two fractions:
    20/84 - 40/84 = 20 - 40/84 = -20/84
  5. After reducing the fraction, the answer is -5/21

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