$\displaystyle (x+y)\frac{dy}{dx}=x-y$

both homogeneous of degree 0, and I need to use the subs: y=vx dy=vdx+xdv, but I get stuck what exactly to do.

I got it down to this: $\displaystyle x(1-v)dx-x(1+v)vdx+xdv=0$ maybe im not seeing something, not exactly sure.