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

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