3 y - 9*y
y^3 - 9*y
1*(x + 3)*(x + 0)*(x - 3)
((1*(x + 3))*(x + 0))*(x - 3)
/ 2\ y*\-9 + y /
y*(-9 + y^2)
y^3 - 9.0*y
y*(-3 + y)*(3 + y)