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Subtract 40/7 from 20/21

1st number: 20/21, 2nd number: 5 5/7

20/21 - 40/7 is -100/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 7 is 21
  2. For the 1st fraction, since 21 × 1 = 21,
    20/21 = 20 × 1/21 × 1 = 20/21
  3. Likewise, for the 2nd fraction, since 7 × 3 = 21,
    40/7 = 40 × 3/7 × 3 = 120/21
  4. Subtract the two fractions:
    20/21 - 120/21 = 20 - 120/21 = -100/21

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