(x-1)(x^2+8+16)=6(x+4)
(x-1)(x^2+8+16)=6(x+4) x^3+4=6x+24 x^3-6x+24-4 x^3-6x=20 x^2-6=20 2x-6=20 2x=20-6 2x=14 x=14/2 x=7