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Subtract 30/50 from 20/90

20/90 - 30/50 is -17/45.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 50 is 450
  2. For the 1st fraction, since 90 × 5 = 450,
    20/90 = 20 × 5/90 × 5 = 100/450
  3. Likewise, for the 2nd fraction, since 50 × 9 = 450,
    30/50 = 30 × 9/50 × 9 = 270/450
  4. Subtract the two fractions:
    100/450 - 270/450 = 100 - 270/450 = -170/450
  5. After reducing the fraction, the answer is -17/45

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