1) +685 + (+182);
2) (-23) + (-977);
3) -343 + 657;
4) (+214) + (-42);
5) (-558) + (+253);
6) 384 + 384;
7) -587 + 0;
8) +408 + (-408);
9) (-289) + (-289);
10) 0 + (+903);
11) (+15) + (-985);
12) -292 + 292.

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