\[x^{2} + 6x \leq 0\]
\[x(x + 6) = 0\]
\[x = 0,\ \ \ x = - 6\]
\[Ответ:\ x = - 6;\ - 5;\ - 4;\ - 3;\ \]
\[- 2;\ - 1;0.\]