Даю 99 баллов! Помогите решить:
9a+17a-30a+4a;
-5x+11x+47x-31x;
15a-a+b-6b;
-12c-12a+7a+6c;
k+(m+n);
k-(m+n);
(x-y)+(a+b);
(a-c)-(b-d);
2a+(3a-8b);
-5b-(8a-5b);
(5-2b)-(7+10b);
-(3c+5x)-(9c-6x);
x-(x-15)+(13+x);
(3a-21)-2a-(17-8a);
7(5a+8)-11a;
9x+3(15-8x);
13a-8(7a-1);
-2(2p-1)+4.
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