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Subtract 9/7 from 18/20

1st number: 18/20, 2nd number: 1 2/7

18/20 - 9/7 is -27/70.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 7 is 140
  2. For the 1st fraction, since 20 × 7 = 140,
    18/20 = 18 × 7/20 × 7 = 126/140
  3. Likewise, for the 2nd fraction, since 7 × 20 = 140,
    9/7 = 9 × 20/7 × 20 = 180/140
  4. Subtract the two fractions:
    126/140 - 180/140 = 126 - 180/140 = -54/140
  5. After reducing the fraction, the answer is -27/70

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