\[\left\{ \begin{matrix} x^{2} + 5x - 6 > 0 \\ x < a\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ \end{matrix} \right.\ \]
\[x^{2} + 5x - 6 = 0\]
\[x_{1} + x_{2} = - 5,\ \ x_{1} \cdot x_{2} = - 6\]
\[x_{1} = - 6,\ \ x_{2} = 1\]
\[Если\ a < - 6:\]
\[x < a.\]
\[Если\ \ - 6 \leq a \leq 1:\]
\[x < - 6.\]
\[Если\ a > 1:\ \]
\[x < - 6\ \ \ и\ \ 1 < x < a.\]