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Subtract 9/21 from 18/80

18/80 - 9/21 is -57/280.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 80 and 21 is 1680
  2. For the 1st fraction, since 80 × 21 = 1680,
    18/80 = 18 × 21/80 × 21 = 378/1680
  3. Likewise, for the 2nd fraction, since 21 × 80 = 1680,
    9/21 = 9 × 80/21 × 80 = 720/1680
  4. Subtract the two fractions:
    378/1680 - 720/1680 = 378 - 720/1680 = -342/1680
  5. After reducing the fraction, the answer is -57/280

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