You can put this solution on YOUR website! you can only group "like" numbers, as in, they have to have the same variables e.g. x, a, b, etc and the same exponents e.g. x^2 and x^2, or a^3 and a^3 you cant combine xy^2 and ab^3
with that said...
x2 - 6x + 5x - 30
x2 -x -30
and i dont think that that can factor down any more