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Subtract 30/81 from 20/75

20/75 - 30/81 is -14/135.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 75 and 81 is 2025
  2. For the 1st fraction, since 75 × 27 = 2025,
    20/75 = 20 × 27/75 × 27 = 540/2025
  3. Likewise, for the 2nd fraction, since 81 × 25 = 2025,
    30/81 = 30 × 25/81 × 25 = 750/2025
  4. Subtract the two fractions:
    540/2025 - 750/2025 = 540 - 750/2025 = -210/2025
  5. After reducing the fraction, the answer is -14/135

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