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Subtract 9/40 from 12/84

12/84 - 9/40 is -23/280.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 40 is 840
  2. For the 1st fraction, since 84 × 10 = 840,
    12/84 = 12 × 10/84 × 10 = 120/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    9/40 = 9 × 21/40 × 21 = 189/840
  4. Subtract the two fractions:
    120/840 - 189/840 = 120 - 189/840 = -69/840
  5. After reducing the fraction, the answer is -23/280

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