TeX джерело:

\frac{{x - 2}}{{x - 7}} > 0;\;\left\{ \begin{array}{l}x - 2 > 0,\\x - 7 > 0\end{array} \right.\;abo\;\left\{ \begin{array}{l}x - 2 < 0,\\x - 7 < 0;\end{array} \right.\;todi\;\left\{ \begin{array}{l}x > 2,\\x > 7\end{array} \right.\;abo\;\left\{ \begin{array}{l}x < 2,\\x < 7.\end{array} \right.