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Subtract 3/9 from 20/84

20/84 - 3/9 is -2/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 9 is 252
  2. For the 1st fraction, since 84 × 3 = 252,
    20/84 = 20 × 3/84 × 3 = 60/252
  3. Likewise, for the 2nd fraction, since 9 × 28 = 252,
    3/9 = 3 × 28/9 × 28 = 84/252
  4. Subtract the two fractions:
    60/252 - 84/252 = 60 - 84/252 = -24/252
  5. After reducing the fraction, the answer is -2/21

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