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Subtract 21/9 from 15/42

1st number: 15/42, 2nd number: 2 3/9

15/42 - 21/9 is -83/42.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 9 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 9 × 14 = 126,
    21/9 = 21 × 14/9 × 14 = 294/126
  4. Subtract the two fractions:
    45/126 - 294/126 = 45 - 294/126 = -249/126
  5. After reducing the fraction, the answer is -83/42

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