5x+(6y-7x). 2x-(15-9x). 2a-3(6a-1) памогите

Question

5x+(6y-7x). 2x-(15-9x). 2a-3(6a-1) памогите

Answer 1

5x+(6y-7x) = 5x+6y-7x = -2x+6y;
2x-(15-9x) = 2x-15+9x = 11x-15;
2a-3(6a-1) = 2a-3*6a-1 = 12a+3.

Удачи !)