Fuente TeX:

\framebox{\begin{tikzpicture}   \draw[line width=0.3cm,color=red!30,cap=round,join=round] (-3.88,0)--(1.88,0);   \draw[thick] (-5,0)--(3,0);    \draw[shift={(-4,0)},color=darkgray,thin] (0pt,3pt) -- (0pt,-3pt) node[below] {$-4$};    \draw[shift={(2,0)},color=darkgray,thin] (0pt,3pt) -- (0pt,-3pt) node[below] {$2$};    \draw[shift={(2,0)},color=black,very thick]  node {$)$};    \draw[shift={(-4,0)},color=black,very thick]  node {$($}; \end{tikzpicture} }