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Subtract 5/8 from 12/42

12/42 - 5/8 is -19/56.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 8 is 168
  2. For the 1st fraction, since 42 × 4 = 168,
    12/42 = 12 × 4/42 × 4 = 48/168
  3. Likewise, for the 2nd fraction, since 8 × 21 = 168,
    5/8 = 5 × 21/8 × 21 = 105/168
  4. Subtract the two fractions:
    48/168 - 105/168 = 48 - 105/168 = -57/168
  5. After reducing the fraction, the answer is -19/56

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