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Subtract 20/42 from 4/54

4/54 - 20/42 is -76/189.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 54 and 42 is 378
  2. For the 1st fraction, since 54 × 7 = 378,
    4/54 = 4 × 7/54 × 7 = 28/378
  3. Likewise, for the 2nd fraction, since 42 × 9 = 378,
    20/42 = 20 × 9/42 × 9 = 180/378
  4. Subtract the two fractions:
    28/378 - 180/378 = 28 - 180/378 = -152/378
  5. After reducing the fraction, the answer is -76/189

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