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Subtract 20/84 from 5/15

5/15 - 20/84 is 2/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 84 is 420
  2. For the 1st fraction, since 15 × 28 = 420,
    5/15 = 5 × 28/15 × 28 = 140/420
  3. Likewise, for the 2nd fraction, since 84 × 5 = 420,
    20/84 = 20 × 5/84 × 5 = 100/420
  4. Subtract the two fractions:
    140/420 - 100/420 = 140 - 100/420 = 40/420
  5. After reducing the fraction, the answer is 2/21

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