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Subtract 6/8 from 5/21

5/21 - 6/8 is -43/84.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 8 is 168
  2. For the 1st fraction, since 21 × 8 = 168,
    5/21 = 5 × 8/21 × 8 = 40/168
  3. Likewise, for the 2nd fraction, since 8 × 21 = 168,
    6/8 = 6 × 21/8 × 21 = 126/168
  4. Subtract the two fractions:
    40/168 - 126/168 = 40 - 126/168 = -86/168
  5. After reducing the fraction, the answer is -43/84

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