\[\left\{ \begin{matrix} x > 3(2x - 1) + 18 \\ 2x - (x - 4) < 6\ \ \ \ \ \\ \end{matrix} \right.\ \]
\[\left\{ \begin{matrix} x > 6x - 3 + 18 \\ 2x - x + 4 < 6\ \ \ \\ \end{matrix} \right.\ \]
\[\left\{ \begin{matrix} 5x < - 15 \\ x < 2\ \ \ \ \ \ \ \ \\ \end{matrix} \right.\ \]
\[\left\{ \begin{matrix} x < - 3 \\ x < 2\ \ \ \ \\ \end{matrix} \right.\ \]
\[Ответ:x < - 3.\]