Решите систему неравенств -0,4x<2,5; -0,5x>=3,1; 1,05x>-6,51.

\[\left\{ \begin{matrix} - 0,4x < 2,5\ \ \ \ \\ - 0,5x \geq 3,1\ \ \ \ \\ 1,05x \geq - 6,51 \\ \end{matrix} \right.\ \Longrightarrow \left\{ \begin{matrix} x > - \frac{25}{4}\text{\ \ } \\ x \leq - \frac{31}{5}\text{\ \ } \\ x \geq - \frac{651}{105} \\ \end{matrix} \right.\ \]

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

\[Ответ:\ - 6,2.\]