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Subtract 20/80 from 4/42

4/42 - 20/80 is -13/84.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 80 is 1680
  2. For the 1st fraction, since 42 × 40 = 1680,
    4/42 = 4 × 40/42 × 40 = 160/1680
  3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
    20/80 = 20 × 21/80 × 21 = 420/1680
  4. Subtract the two fractions:
    160/1680 - 420/1680 = 160 - 420/1680 = -260/1680
  5. After reducing the fraction, the answer is -13/84

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