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Subtract 12/18 from 9/15

9/15 - 12/18 is -1/15.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 18 is 90
  2. For the 1st fraction, since 15 × 6 = 90,
    9/15 = 9 × 6/15 × 6 = 54/90
  3. Likewise, for the 2nd fraction, since 18 × 5 = 90,
    12/18 = 12 × 5/18 × 5 = 60/90
  4. Subtract the two fractions:
    54/90 - 60/90 = 54 - 60/90 = -6/90
  5. After reducing the fraction, the answer is -1/15

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