1) (-546) + (-9454);
2) -9045 - (-9045);
3) +4494 + (-4494);
4) (-3375) + (+6625);
5) (+4086) + 4086;
6) 3774 - (+213);
7) 0 - (-8429);
8) -5586 - (-25);
9) +9694 - 0;
10) (+67) + (-4461);
11) (-5459) - 3509;
12) 0 + (+1271).

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