An easy function problem.

Level pending

Suppose there exists a function such that \[Q(x,y) = x\cdot Q(x,1) + y\cdot Q(1,y) + xy.\] Allow for \(i=\sqrt{-1}\). The value of \(Q(7i,Q(5,3i))\) can be expressed in the form \(a+bi\); determine \(|a+b|-13\).

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