Помогите пожалуйста! Срочно нужно!
1)-6a+5a;
2)-4(2x-3x);
3)ax-bx;
4)-3-(m+n);
5)7x-3y-6x+13y;
6)4(x-5)-3x+6;
7)-5(c+3)-(3c-4);
8)2x(2b+4c)-x(7a-3b);
9)9m-6k+12m-15k.
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