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Subtract 21/12 from 30/54

1st number: 30/54, 2nd number: 1 9/12

30/54 - 21/12 is -43/36.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 54 and 12 is 108
  2. For the 1st fraction, since 54 × 2 = 108,
    30/54 = 30 × 2/54 × 2 = 60/108
  3. Likewise, for the 2nd fraction, since 12 × 9 = 108,
    21/12 = 21 × 9/12 × 9 = 189/108
  4. Subtract the two fractions:
    60/108 - 189/108 = 60 - 189/108 = -129/108
  5. After reducing the fraction, the answer is -43/36

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