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Subtract 42/80 from 7/15

7/15 - 42/80 is -7/120.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 80 is 240
  2. For the 1st fraction, since 15 × 16 = 240,
    7/15 = 7 × 16/15 × 16 = 112/240
  3. Likewise, for the 2nd fraction, since 80 × 3 = 240,
    42/80 = 42 × 3/80 × 3 = 126/240
  4. Subtract the two fractions:
    112/240 - 126/240 = 112 - 126/240 = -14/240
  5. After reducing the fraction, the answer is -7/120

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