x^3-9x^2+8x+60=0
x^3+8-9x^2+8x+52=0
(x+2)(x^2-2x+4)-(x+2)(9x-26)=0
(x+2)(x^2-11x+30)=0
(x+2)(x-5)(x-6)=0
x1=-2,x2=5,x3=6