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Subtract 42/45 from 4/21

4/21 - 42/45 is -26/35.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 45 is 315
  2. For the 1st fraction, since 21 × 15 = 315,
    4/21 = 4 × 15/21 × 15 = 60/315
  3. Likewise, for the 2nd fraction, since 45 × 7 = 315,
    42/45 = 42 × 7/45 × 7 = 294/315
  4. Subtract the two fractions:
    60/315 - 294/315 = 60 - 294/315 = -234/315
  5. After reducing the fraction, the answer is -26/35

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