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Add 3/21 and 9/21

3/21 + 9/21 is 4/7.

Steps for adding fractions

  1. Add the two fractions:
    3/21 + 9/21 = 3 + 9/21 = 12/21
  2. 12/21 simplified gives 4/7
  3. So, 3/21 + 9/21 = 4/7

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