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Subtract 40/21 from 30/84

1st number: 30/84, 2nd number: 1 19/21

30/84 - 40/21 is -65/42.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 21 is 84
  2. For the 1st fraction, since 84 × 1 = 84,
    30/84 = 30 × 1/84 × 1 = 30/84
  3. Likewise, for the 2nd fraction, since 21 × 4 = 84,
    40/21 = 40 × 4/21 × 4 = 160/84
  4. Subtract the two fractions:
    30/84 - 160/84 = 30 - 160/84 = -130/84
  5. After reducing the fraction, the answer is -65/42

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