(2x+3)(x-4)-(x+2)(x-b)=x²+62x²-8x+3x-12-(x²-bx+2x-2b)=x²+62x²-8x+3x-12-x²+bx-2x+2b-x²-6=02x²-x²-x²-8x+3x-2x+bx-12-6+2b=0(b-7)x=18-2b当b≠0时,x=(18-2b)...