1. Вычислить: 1) 23+(-12);
2)-58+(-13);
3) -74+11;
4) 62-(-17);
5)-24-(-11);
6) 23-(-12);
7) -205-38;
8) -159+159+(-6);
9) (135+59)+(-135)

№2. Для какого x верно равенство:
а) -8+x=15; б) 27+x=-511; в) x+(-375)=+375
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