\[\left\{ \begin{matrix} \frac{4}{9}x - 1 < x - \frac{4}{9}\ \ | \cdot 9 \\ x^{2} < 18\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ \ \ \ \ }\]
\[\left\{ \begin{matrix} 4x - 9 < 9x - 4\ \\ - \sqrt{18} < x < \sqrt{18} \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ \ \ \ }\]
\[\left\{ \begin{matrix} 9x - 4x > - 9 + 4 \\ - \sqrt{18} < x < \sqrt{18}\ \\ \end{matrix} \right.\ \]
\[\left\{ \begin{matrix} 5x > - 5\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ - \sqrt{18} < x < \sqrt{18} \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ \ \ \ \ \ }\]
\[\left\{ \begin{matrix} x > - 1\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ - \sqrt{18} < x < \sqrt{18} \\ \end{matrix} \right.\ \]
\[Ответ:\ \ 4.\]