sum simplification

2018-03-13 20:23:01

I have this sum

Sum[-E^(-j (x kx[p] + y ky[q] + z kz[r])) j g w ky[q] Ux[p, q, r],

{p, -∞, ∞}, {q, -∞, ∞}, {r, -∞, ∞}]

and I would like to pull constants out of the triple sum. I have so many terms that is why I prefer to do it automatic.

Thanks in advance