Question Number 176968 by Tolmasbek last updated on 28/Sep/22
$$ \\ $$$$\:\:\:{f}\left({x}\right)+\mathrm{3}{f}\left(\frac{\mathrm{1}}{{x}}\right)=\frac{\mathrm{1}}{{x}}\:\:\:\:\:\:\:\:\:\:\:\:\:{f}\left({x}\right)=?\:\:\:\:\:\:\:\:\:\:\: \\ $$$$ \\ $$