1) (-823) - (+148);
2) +921 + (-921);
3) 0 + 554;
4) (+127) + (-467);
5) 0 - (-813);
6) 283 + (+283);
7) +667 - 0;
8) -304 + 696;
9) (-15) + (-985);
10) -819 - (-819);
11) (-202) - (-19);
12) (+381) - (+28).
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