1) +323 + (+323);
2) (-43) + (-957);
3) -296 + 704;
4) (+649) + (+113);
5) 26 + (-974);
6) +819 + (-99);
7) (-259) + (-259);
8) -324 + 177;
9) (-241) + 0;
10) (+135) + (-135);
11) 0 + (+683);
12) -269 + 269.
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