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Subtract 7/20 from 2/7

2/7 - 7/20 is -9/140.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 7 and 20 is 140
  2. For the 1st fraction, since 7 × 20 = 140,
    2/7 = 2 × 20/7 × 20 = 40/140
  3. Likewise, for the 2nd fraction, since 20 × 7 = 140,
    7/20 = 7 × 7/20 × 7 = 49/140
  4. Subtract the two fractions:
    40/140 - 49/140 = 40 - 49/140 = -9/140

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