52+8
60
60-23
37
66+23
89
9+9
18
63+11
74
69-58
11
87-3
84
6+6
12
56+36
92
99-40
59
90-20
70
5+5
10
50+58
108
52-43
9
120+10
130
28
72+72
144
120-70
50
400+400
800
25+25
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