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Subtract 3/18 from 20/42

20/42 - 3/18 is 13/42.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 18 is 126
  2. For the 1st fraction, since 42 × 3 = 126,
    20/42 = 20 × 3/42 × 3 = 60/126
  3. Likewise, for the 2nd fraction, since 18 × 7 = 126,
    3/18 = 3 × 7/18 × 7 = 21/126
  4. Subtract the two fractions:
    60/126 - 21/126 = 60 - 21/126 = 39/126
  5. After reducing the fraction, the answer is 13/42

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