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what is a set of related addition and subtraction number sentences useing the same numbers

2 + 5 = 7
7 - 2 = 5

10 + 4 = 14
14 - 4 = 10

15 - 7 = 8
15 - 8 = 7

8 + 7 = 15
7 + 8 = 15

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