\[\left\{ \begin{matrix} 7x + 14 > 0 \\ 3x - 9 < 0\ \ \\ \end{matrix} \right.\ \]
\[\left\{ \begin{matrix} 7x > - 14 \\ 3x < 9\ \ \ \ \ \\ \end{matrix} \right.\ \]
\[\left\{ \begin{matrix} x > - 2 \\ x < 3\ \ \ \ \\ \end{matrix} \right.\ \]
\[- 2 < x < 3.\]
\[Ответ:\ - 2 < x < 3.\]