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Subtract 20/42 from 5/15

5/15 - 20/42 is -1/7.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 42 is 210
  2. For the 1st fraction, since 15 × 14 = 210,
    5/15 = 5 × 14/15 × 14 = 70/210
  3. Likewise, for the 2nd fraction, since 42 × 5 = 210,
    20/42 = 20 × 5/42 × 5 = 100/210
  4. Subtract the two fractions:
    70/210 - 100/210 = 70 - 100/210 = -30/210
  5. After reducing the fraction, the answer is -1/7

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