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Subtract 84/20 from 8/42

1st number: 8/42, 2nd number: 4 4/20

8/42 - 84/20 is -421/105.

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,
    8/42 = 8 × 10/42 × 10 = 80/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    84/20 = 84 × 21/20 × 21 = 1764/420
  4. Subtract the two fractions:
    80/420 - 1764/420 = 80 - 1764/420 = -1684/420
  5. After reducing the fraction, the answer is -421/105

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