\(f,\Leftrightarrow\left[{}\begin{matrix}\left\{{}\begin{matrix}3x-1>0\\2x+4>0\end{matrix}\right.\\\left\{{}\begin{matrix}3x-1< 0\\2x+4< 0\end{matrix}\right.\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x>\dfrac{1}{3}\\x< -2\end{matrix}\right.\\ g,\Leftrightarrow\left[{}\begin{matrix}\left\{{}\begin{matrix}x-7>0\\3x+4< 0\end{matrix}\right.\\\left\{{}\begin{matrix}x-7< 0\\3x+4>0\end{matrix}\right.\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}\left\{{}\begin{matrix}x>7\\x< -\dfrac{4}{3}\end{matrix}\right.\\-\dfrac{4}{3}< x< 7\end{matrix}\right.\Leftrightarrow-\dfrac{4}{3}< x< 7\)
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