For any non-zero real number&nbsp;x, let&nbsp;f(x)+2f(1/x)=3x. Then, the sum of all possible values of&nbsp;x&nbsp;for which&nbsp;f(x)=3, is

CATKing Student

For any non-zero real number $x$ , let $f (x) + 2 f (\frac{1}{x}) = 3 x$ . Then, the sum of all possible values of $x$ for which $f (x) = 3$ , is

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