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https://groups.google.com/forum/?hl=en#!topic/sage-devel/0deu-ScIpgA
sage: sum(2^(-x)+3^(-x), x, 1, oo)
sum(3^(-x)*(3^x + 2^x)*2^(-x), x, 1, +Infinity)
sage: sum(2^(-x)+3^(-x), x, 1, oo).simplify_full()
sum((3^x + 2^x)/(3^x*2^x), x, 1, +Infinity)
sage: maxima("sum(2^(-x)+3^(-x), x, 1, inf), simpsum;")
3/2
Component: symbolics
Issue created by migration from https://trac.sagemath.org/ticket/20520