\[0,6x^{2} < - 18x\]
\[0,6x^{2} + 18x = 0\]
\[0,6x(x + 30) = 0\]
\[x = 0,\ \ \ \ \ x = - 30\ \]
\[Ответ:x \in ( - 30;\ \ 0)\text{.\ }\]