Karagota

<math>\left( { - \infty ; - 7} \right]\left. \cup \left[ - 1;0\right] \cup \left[0;1\right] \cup \right.\left. {\begin{matrix} {} \\ {} \\\end{matrix}} \right]1;\frac{7}{6}\left[ {\begin{matrix}{}\\.\\\end{matrix}} \right.</math>