(2x^3-2x^2)-(x^2-1)=0
2x^2(x-1)-(x+1)(x-1)=0
(x-1)(2x^2-x-1)=0
(x-1)(x-1)(2x+1)=0
(x-1)^2*(2x+1)=0
所以x=1或x=-1/2