Točno
July 7, 2023, 4:05 p.m. (1 year, 7 months)
Find all functions f: \mathbb{R} \to \mathbb{R}, such that f(xf(y)) + f(f(x) + f(y)) = yf(x) + f(x + f(y)) holds for all x, y \in \mathbb{R}, where \mathbb{R} denotes the set of real numbers.
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