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Subtract 42/90 from 5/84

5/84 - 42/90 is -57/140.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 90 is 1260
  2. For the 1st fraction, since 84 × 15 = 1260,
    5/84 = 5 × 15/84 × 15 = 75/1260
  3. Likewise, for the 2nd fraction, since 90 × 14 = 1260,
    42/90 = 42 × 14/90 × 14 = 588/1260
  4. Subtract the two fractions:
    75/1260 - 588/1260 = 75 - 588/1260 = -513/1260
  5. After reducing the fraction, the answer is -57/140

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