Help! I think I am right, but not sure.

Question

Factor out greatest common factor then simplify the factors
15wx-20wy-25wz=
5w(3x)+5w(-4y)+5w(-5z)=
5w(3w-4y-5z)=
5w

Answer 1

I agree with you as far as 5w(3w-4y-5z).

That does not equal 5w.