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Subtract 35/45 from 12/21

12/21 - 35/45 is -13/63.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 45 is 315
  2. For the 1st fraction, since 21 × 15 = 315,
    12/21 = 12 × 15/21 × 15 = 180/315
  3. Likewise, for the 2nd fraction, since 45 × 7 = 315,
    35/45 = 35 × 7/45 × 7 = 245/315
  4. Subtract the two fractions:
    180/315 - 245/315 = 180 - 245/315 = -65/315
  5. After reducing the fraction, the answer is -13/63

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