2+4
6
-2 + 1
-1
-1 + 1
0
14+7
21
-6 + 4
-2
-6 + 16
10
20+43
63
(-2) + (-2)
-4
-66
67+68
135
-400 + 670
270
(-27) + (-30)
-57
940+467
1407
(-1000) + (-650)
-1650
(-45) + (-72)
-117
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