Упростите выражение, применяя свойства сложения
1) (9+а)+11;
2) (16+b)+4;
3) (7+с)+3
4) (а+33)+17
5) (b+28)+12
6) (a+17)+13
7) (b+22)+8
8) (c+15)+5
9) (c+19)+21
10) (18+x)+12
11) (23+y)+7
12) (56+z)+4
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