5. An odd function $f ( x )$ has domain $[ - 5,5 ]$. When $x \in [ 0,5 ]$, the graph of $f ( x )$ is shown in the figure on the right. The solution set of the inequality $f ( x ) < 0$ is $\_\_\_\_$.
5. An odd function $f ( x )$ has domain $[ - 5,5 ]$. When $x \in [ 0,5 ]$, the graph of $f ( x )$ is shown in the figure on the right. The solution set of the inequality $f ( x ) < 0$ is $\_\_\_\_$.