3x-12-2x+6=12x-108 11x=102 x=102/11 题目错了吧，加减号
3(x-4)-2(x-3)=12(x-9)3x-12-2x+6=12x-108X-6=12x-108108-6=12x-x102=11xX=9.27
3（x-4)-2(x-3)=12(x-9) 3x-12-2x+6=12x-108x-6=12x-10811x=102x=102/11
