Y by farhad.fritl
Find all functions
such that
holds for all
.
Proposed by owoovo.shih and CrazyInMath

![\[f(xf(y)+f(x+y)+1)=(y+1)f(x+1)\]](http://latex.artofproblemsolving.com/4/9/e/49ec422b640766de653d9d640bbc45065a6ac375.png)

Proposed by owoovo.shih and CrazyInMath
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