9-2(x+3)=x-(3+6x)9x-3(x-2)=6x+29-2x-6=x-3-6x9x-3x+6 =6x+23-2x=-3-5x6x+6=6x+2-2x+5x=-3-36x-6x=-4 x无解 3x=-6 ...