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You multiply to make the denominators the same then add.

To add 12/13 and 15/7 you do the following:

  1. multiply 12/13 by 7/7 giving 84/91
  2. multiply 15/7 by 13/13 giving 195/91
  3. add 84/91 and 195/91 giving 279/91
  4. if possible try to remove common factors from numerator and denominator, but that isn't possible here.
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9y ago

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