x^3+3=3x^2+x
x^3-3x^2-x+3=0
x^2(x-3)-(x-3)=0
(x-3)(x^2-1)=0
x=3
x=1
x=-1
x^3-9x=0
x(x^2-9)=0
x=0
x=-3
x^3+3=3x^2+x
x^3-3x^2-x+3=0
x^2(x-3)-(x-3)=0
(x-3)(x^2-1)=0
x=3
x=1
x=-1
x^3-9x=0
x(x^2-9)=0
x=0
x=-3
x=3