Помогите пожалуйста

Упростить выражения
а)2•а+4•а;
10•z-8•z;
6•n+n;
3•c-c;
8•y-7•y;
x+x;
б)9x+7x;
10k-k;
12a-3a;
5b-4b;
16m+m;
c+c.

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