\[\boxed{\mathbf{988.\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[9c - 2 \leq 4c + 4\]
\[9c - 4c \leq 6\]
\[5c \leq 6\]
\[c \leq \frac{6}{5}\]
\[c \leq 1,2\]
\[Ответ:при\ c \in ( - \infty;1,2\rbrack.\]