(x+1)/(x-1)-(3x-3)/(x+1)=2(x+1)^2-(3x-3)(x-1)=2(x+1)(x-1)x^2+2x+1-3x^2+6x-3=2x^2-24x^2-8x=04x(x-2)=04x=0x=0x-2=0x=2
先通分化简得4x(x-2)=0x=0x=2
是（x+1)/(x-1)还是x/(x-1)+1?
