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Subtract 35/18 from 12/21

1st number: 12/21, 2nd number: 1 17/18

12/21 - 35/18 is -173/126.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 18 is 126
  2. For the 1st fraction, since 21 × 6 = 126,
    12/21 = 12 × 6/21 × 6 = 72/126
  3. Likewise, for the 2nd fraction, since 18 × 7 = 126,
    35/18 = 35 × 7/18 × 7 = 245/126
  4. Subtract the two fractions:
    72/126 - 245/126 = 72 - 245/126 = -173/126

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