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Subtract 45/84 from 9/42

9/42 - 45/84 is -9/28.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 84 is 84
  2. For the 1st fraction, since 42 × 2 = 84,
    9/42 = 9 × 2/42 × 2 = 18/84
  3. Likewise, for the 2nd fraction, since 84 × 1 = 84,
    45/84 = 45 × 1/84 × 1 = 45/84
  4. Subtract the two fractions:
    18/84 - 45/84 = 18 - 45/84 = -27/84
  5. After reducing the fraction, the answer is -9/28

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