\[- 5x^{2} \geq - 10x\]
\[- 5x^{2} = - 10x\]
\[- 5x^{2} + 10x = 0\]
\[- 5x(x - 2) = 0\]
\[x = 0,\ \ \ x = 2\]
\[Ответ:\ x \in \ \lbrack 0;\ \ 2\rbrack.\]