$$\left. \begin{array} { l } { f ( x ) = \{ \begin{array} { l } { - x - 6 } & { x \leq - 2 } \\ { 4 } & { - 2 x \lt x \lt 1 } \end{array} } \\ { - 2 x + 6 \approx \geq 1 } \end{array} \right.$$
$\left\{\begin{matrix}x=-\frac{6l}{f+l}\text{, }&f\neq -l\\x\in \mathrm{C}\text{, }&l=0\text{ and }f=0\end{matrix}\right.$
$\left\{\begin{matrix}x=-\frac{6l}{f+l}\text{, }&f\neq -l\\x\in \mathrm{R}\text{, }&l=0\text{ and }f=0\end{matrix}\right.$
