12 - 90 = ____
53 + 52 = ____
23 + 31 = ____
83 - 33 = ____
73 + 53 = ____
43 + 63 = ____
12 + 50 = ____
8 + 82 = ____
82 + 88 = ____
32 - 40 = ____
12 + 16 = ____
82 - 72 = ____
72 - 3 = ____
13 + 42 = ____
51 - 56 = ____
73 - 36 = ____
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