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Subtract 20/7 from 15/40

1st number: 15/40, 2nd number: 2 6/7

15/40 - 20/7 is -139/56.

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,
    15/40 = 15 × 7/40 × 7 = 105/280
  3. Likewise, for the 2nd fraction, since 7 × 40 = 280,
    20/7 = 20 × 40/7 × 40 = 800/280
  4. Subtract the two fractions:
    105/280 - 800/280 = 105 - 800/280 = -695/280
  5. After reducing the fraction, the answer is -139/56

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