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Subtract 8/9 from 4/7

4/7 - 8/9 is -20/63.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 7 and 9 is 63
  2. For the 1st fraction, since 7 × 9 = 63,
    4/7 = 4 × 9/7 × 9 = 36/63
  3. Likewise, for the 2nd fraction, since 9 × 7 = 63,
    8/9 = 8 × 7/9 × 7 = 56/63
  4. Subtract the two fractions:
    36/63 - 56/63 = 36 - 56/63 = -20/63

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