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Subtract 18/21 from 9/56

9/56 - 18/21 is -39/56.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 56 and 21 is 168
  2. For the 1st fraction, since 56 × 3 = 168,
    9/56 = 9 × 3/56 × 3 = 27/168
  3. Likewise, for the 2nd fraction, since 21 × 8 = 168,
    18/21 = 18 × 8/21 × 8 = 144/168
  4. Subtract the two fractions:
    27/168 - 144/168 = 27 - 144/168 = -117/168
  5. After reducing the fraction, the answer is -39/56

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