\[\left\{ \begin{matrix} (2x + 1)(x - 4) < 0 \\ (3x - 1)(x - 3) \geq 0 \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ \ \ \ \ }\]
\[\left\{ \begin{matrix} 2 \cdot \left( x + \frac{1}{2} \right)(x - 4) < 0 \\ 3 \cdot \left( x - \frac{1}{3} \right)(x - 3) \geq 0 \\ \end{matrix} \right.\ \]
\[Ответ:\left( - 0,5;\frac{1}{3} \right\rbrack \cup \lbrack 3;4).\]