6 - (2x-9) =(18+2x) - 3(x-3);
6 - 2x + 9 = 18+2x - 3x +9;
- 2x + 15 = - x + 27;
- 2x + x= 27- 15;
- x = 12;
x = - 12.
6-2x-(-3)=18+2x- 3x + 9
6-2x+3=18+2x- 3x + 9
2x-2x+3x=-6-3+18+9
3x=24
x=8
Надеюсь,сделала правильно)☺
6 - (2x-9) =(18+2x) - 3(x-3);
6 - 2x + 9 = 18+2x - 3x +9;
- 2x + 15 = - x + 27;
- 2x + x= 27- 15;
- x = 12;
x = - 12.