Please, help me.

I have to find the Green's function in the following region, but I don't have any idea how to find it:

I have a conducting spherical shell of radius a; in the center there are 2 spherical shells of radius b both and charge -q, they are a distance d from their centers, and they both have a charge +q in the center. I'm supposed to find Green's function for Dirichlet conditions on the region surrounding the inner spheres.

Here's a image for the problem.

I tried using method of images but I'm not quite sure where should I put image charges. I also tried using spherical coordinates, by describing the inner spheres by a non origin centred sphere equation for boundary conditions, but in this case but I'm not sure how to divide regions for primed and not primed coordinates.

Thank you.

enter image description here


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