3 x - 7*x - 6
x^3 - 7*x - 1*6
1*(x + 2)*(x + 1)*(x - 3)
((1*(x + 2))*(x + 1))*(x - 3)
-6.0 + x^3 - 7.0*x
(1 + x)*(-3 + x)*(2 + x)