(3x+2)(4x-7)=(6x-1)(2x-5)12x²-13x-14=12x²-32x+519x=19∴x=1检验：x=1是方程的根 两边乘以(x-1)(x+2)得2x(x+2)+2(x-1)=2(x-1)(x+2)2x²+4x+2x-2=2x²+2x-44x=-2x=-1/2检验：x=-1/2是方程的根
