Integration using separation of variables.

Hey guys,

This is from an econ class so I am really struggling with some of the pure math.

I need to solve the following differential equation use the separation of variables technique (a,b, and c positive constants):

$\displaystyle dx/dt+ax = b - cx$

What is really confusing to me is what variables I am actually seperating because all I will have on one side is $\displaystyle \int dt$ and it doesn't really seem right to me. But I also can't find any similar examples online.

thanks for any help.