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Subtract 9/7 from 21/9

1st number: 2 3/9, 2nd number: 1 2/7

21/9 - 9/7 is 22/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 9 and 7 is 63
  2. For the 1st fraction, since 9 × 7 = 63,
    21/9 = 21 × 7/9 × 7 = 147/63
  3. Likewise, for the 2nd fraction, since 7 × 9 = 63,
    9/7 = 9 × 9/7 × 9 = 81/63
  4. Subtract the two fractions:
    147/63 - 81/63 = 147 - 81/63 = 66/63
  5. After reducing the fraction, the answer is 22/21
  6. In mixed form: 11/21

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