Answer:
2 + 3 = 5
5 - 2 = 3
3.4 + 7.1 = 10.5
10.5 - 3.4 = 7.1
7 + 8 = 15
15 - 7 = 8
9/5 + 3/2 = 33/10
33/10 - 3/2 = 9/5
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