Given that $f(3)=5$ and $f(3x)=f(x)+2$ for all $x > 0$, find $f^{-1}(11)$.
Question:
Given that $f(3)=5$ and $f(3x)=f(x)+2$ for all $x > 0$, find $f^{-1}(11)$.
Answer:
Let's think step by step.

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Given that $f(3)=5$ and $f(3x)=f(x)+2$ for all $x > 0$, find $f^{-1}(11)$.
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