Answers

Add 21/84 and 15/84

21/84 + 15/84 is 3/7.

Steps for adding fractions

1. Add the two fractions:
   21/84 + 15/84 = 21 + 15/84 = 36/84
2. 36/84 simplified gives 3/7
3. So, 21/84 + 15/84 = 3/7

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