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Subtract 9/7 from 18/40

1st number: 18/40, 2nd number: 1 2/7

18/40 - 9/7 is -117/140.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 7 is 280
  2. For the 1st fraction, since 40 × 7 = 280,
    18/40 = 18 × 7/40 × 7 = 126/280
  3. Likewise, for the 2nd fraction, since 7 × 40 = 280,
    9/7 = 9 × 40/7 × 40 = 360/280
  4. Subtract the two fractions:
    126/280 - 360/280 = 126 - 360/280 = -234/280
  5. After reducing the fraction, the answer is -117/140

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