TeX джерело:

\left\{ \begin{array}{l} - 12x - 3x < - 1 + 1,\\ - 6x - 4x > 4 - 2;\end{array} \right.\quad \left\{ \begin{array}{l} - 15x < 0,\\ - 10x > 2;\end{array} \right.\quad \left\{ \begin{array}{l}x > 0,\\x < - 0,2.\end{array} \right.