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Question Number 50396 by Abdo msup. last updated on 16/Dec/18
$${finf}\:{all}\:{functions}\:{f}\:{continues}\:{with}\:{verfy} \\ $$$${f}\left(\mathrm{2}{x}+\mathrm{1}\right)={f}\left({x}\right)\:\:\forall{x}\in{R} \\ $$