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OpenStudy (anonymous):
Find all surjective functions f:ℝ→ℝ such that for every x,y∈ℝ f(x+f(x)+2f(y))=f(2x)+f(2y)
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OpenStudy (anonymous):
This is a repost, but it's k, cause nobody answered it before.
OpenStudy (anonymous):
f(x)=mx?
OpenStudy (anonymous):
But the question says all :-/
OpenStudy (anonymous):
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