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Subtract 9/81 from 25/42

25/42 - 9/81 is 61/126.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 81 is 1134
  2. For the 1st fraction, since 42 × 27 = 1134,
    25/42 = 25 × 27/42 × 27 = 675/1134
  3. Likewise, for the 2nd fraction, since 81 × 14 = 1134,
    9/81 = 9 × 14/81 × 14 = 126/1134
  4. Subtract the two fractions:
    675/1134 - 126/1134 = 675 - 126/1134 = 549/1134
  5. After reducing the fraction, the answer is 61/126

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