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Subtract 20/30 from 5/42

5/42 - 20/30 is -23/42.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 30 is 210
  2. For the 1st fraction, since 42 × 5 = 210,
    5/42 = 5 × 5/42 × 5 = 25/210
  3. Likewise, for the 2nd fraction, since 30 × 7 = 210,
    20/30 = 20 × 7/30 × 7 = 140/210
  4. Subtract the two fractions:
    25/210 - 140/210 = 25 - 140/210 = -115/210
  5. After reducing the fraction, the answer is -23/42

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