\[\left\{ \begin{matrix} 12x - 9 < 7x + 11 \\ 11x - 13 > 7x - 4 \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ \ \ }\]
\[\left\{ \begin{matrix} 5x < 20 \\ 4x > 9\ \ \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ }\]
\[\left\{ \begin{matrix} x < 4\ \ \ \ \ \ \\ x > 2,25 \\ \end{matrix} \right.\ \]
\[Ответ:(2,25;4).\]