$$\( \mathrm{f}(x)=3 x+2 \quad \mathrm{~g}(x)=x^{2}+1 \quad \mathrm{~h}(x)=4^{x}\)$$ Find $$\(\mathrm{f}^{-1}(x)\)$$ $$\[ \mathrm{f}^{-1}(x)= ............................................ \]$$

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