Решите систему неравенств -0,4x<=2,5; -0,5x>3,1; 0,92x<=-5,75.

\[\left\{ \begin{matrix}
- 0,4x \leq 2,5\ \ \ \ \\
- 0,5x > 3,1\ \ \ \ \\
0,92x \leq - 5,75 \\
\end{matrix} \right.\ \Longrightarrow \left\{ \begin{matrix}
x \geq - \frac{25}{4}\text{\ \ } \\
x < - \frac{31}{5}\text{\ \ } \\
x \leq - \frac{575}{92} \\
\end{matrix} \right.\ \]

\[\left\{ \begin{matrix}
x \geq - 6,25 \\
x < - 6,2\ \ \\
x \leq - 6,25 \\
\end{matrix} \right.\ \Longrightarrow x = - 6,25.\]

\[Ответ:\ - 6,25.\]