bridge hands and math and computer science and programming and puzzles and etc and etc.
This problem from IMO 2019 (international maths olympiad) was surprisingly easier than expected.
Find all functions $f: Z \to Z$ such that
$$ f(2a) + 2f(b) = f(f(a+b)) \quad \quad \forall a,b \in Z$$
$Z$ is the set of integers.
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