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Subtract 50/90 from 40/42

40/42 - 50/90 is 25/63.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 90 is 630
  2. For the 1st fraction, since 42 × 15 = 630,
    40/42 = 40 × 15/42 × 15 = 600/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    50/90 = 50 × 7/90 × 7 = 350/630
  4. Subtract the two fractions:
    600/630 - 350/630 = 600 - 350/630 = 250/630
  5. After reducing the fraction, the answer is 25/63

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