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Subtract 8/21 from 8/42

8/42 - 8/21 is -4/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 21 is 42
  2. For the 1st fraction, since 42 × 1 = 42,
    8/42 = 8 × 1/42 × 1 = 8/42
  3. Likewise, for the 2nd fraction, since 21 × 2 = 42,
    8/21 = 8 × 2/21 × 2 = 16/42
  4. Subtract the two fractions:
    8/42 - 16/42 = 8 - 16/42 = -8/42
  5. After reducing the fraction, the answer is -4/21

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