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Subtract 3/42 from 7/20

7/20 - 3/42 is 39/140.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 42 is 420
  2. For the 1st fraction, since 20 × 21 = 420,
    7/20 = 7 × 21/20 × 21 = 147/420
  3. Likewise, for the 2nd fraction, since 42 × 10 = 420,
    3/42 = 3 × 10/42 × 10 = 30/420
  4. Subtract the two fractions:
    147/420 - 30/420 = 147 - 30/420 = 117/420
  5. After reducing the fraction, the answer is 39/140

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