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Algebra Difficulty 7.8 National olympiad, round 2 Find the answer
Let R>0 be the set of all positive real numbers. Find all functions f:R>0→R>0 such that for all x,y∈R>0 we have f(x)=f(f(f(x))+y)+f(xf(y))f(x+y).
A number or a short expression. Spacing and $ signs are ignored.
Solution
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