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Subtract 42/30 from 15/42

1st number: 15/42, 2nd number: 1 12/30

15/42 - 42/30 is -73/70.

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,
    15/42 = 15 × 5/42 × 5 = 75/210
  3. Likewise, for the 2nd fraction, since 30 × 7 = 210,
    42/30 = 42 × 7/30 × 7 = 294/210
  4. Subtract the two fractions:
    75/210 - 294/210 = 75 - 294/210 = -219/210
  5. After reducing the fraction, the answer is -73/70

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