At first glance this looked really easy to me. Boy was I proven wrong!

Anyway, I have to factorize:

$\displaystyle ax+3x+2a+6$

There's a relationship between the x's and a's since the sum of the coefficients of the first 3 parts is $\displaystyle 1+3+2=6$. If this can be turned into a -6 then it would be easier to factorize.

Any help will be greatly appreciated.