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Subtract 20/54 from 30/42

30/42 - 20/54 is 65/189.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 54 is 378
  2. For the 1st fraction, since 42 × 9 = 378,
    30/42 = 30 × 9/42 × 9 = 270/378
  3. Likewise, for the 2nd fraction, since 54 × 7 = 378,
    20/54 = 20 × 7/54 × 7 = 140/378
  4. Subtract the two fractions:
    270/378 - 140/378 = 270 - 140/378 = 130/378
  5. After reducing the fraction, the answer is 65/189

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