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Subtract 35/18 from 15/42

1st number: 15/42, 2nd number: 1 17/18

15/42 - 35/18 is -100/63.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 18 is 126
  2. For the 1st fraction, since 42 × 3 = 126,
    15/42 = 15 × 3/42 × 3 = 45/126
  3. Likewise, for the 2nd fraction, since 18 × 7 = 126,
    35/18 = 35 × 7/18 × 7 = 245/126
  4. Subtract the two fractions:
    45/126 - 245/126 = 45 - 245/126 = -200/126
  5. After reducing the fraction, the answer is -100/63

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