$$\[ \mathrm{f}(x)=3 x-2 \quad \mathrm{~g}(x)=5 x-7 \quad \mathrm{~h}(x)=x^{2}+x \quad \mathrm{j}(x)=3^{x} \]$$ Find $$\(x\)$$ when $$\(\mathrm{j}^{-1}(x)=4\)$$. $$\[ x=............................................. \]$$

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