\[\left\{ \begin{matrix} - 0,3x < 1,6\ \ \ \ \\ - 0,4x \geq 2,1\ \ \ \ \\ 0,92x \geq - 4,83 \\ \end{matrix} \right.\ \Longrightarrow \left\{ \begin{matrix} x > - \frac{16}{3}\text{\ \ } \\ x \leq - \frac{21}{4}\text{\ \ \ } \\ x \geq - \frac{483}{92} \\ \end{matrix} \right.\ \]
\[\left\{ \begin{matrix} x > - 5\frac{1}{3}\text{\ \ \ } \\ x \leq - 5,25 \\ x \geq - 5,25 \\ \end{matrix} \right.\ \Longrightarrow x = - 5,25.\]
\[Ответ:\ - 5,25.\]