2. If a line $l$ is intercepted by two other lines $l_{1}: 4 x+y+6=0$ and $l_{2}: 3 x-5 y-6=0$ such that the midpoint of the segment is exactly the origin, then the equation of the line $l$ is $\qquad$ .
Let the intersection point of $l$ and $l_{1}$ be $\left(x_{0}, y_{0}\right)$, then we have $\left\{\begin{array}{l}4 x_{0}+y_{0}+6=0, \\ -3 x_{0}+5 y_{0}-6=0\end{array} \Rightarrow\left\{\begin{array}{l}x_{0}=-\frac{36}{23}, \\ y_{0}=\frac{6}{23} .\end{array}\right.\right.$ Therefore, the equation of the line $l$ is $x+6 y=0$.