TeX джерело:

\left\{ \begin{array}{l}2x - 3y = 10,\\3x - 2y = 5,\end{array} \right.\;\left\{ \begin{array}{l}(2x - 3y) \cdot 2 + (3x + 2y) \cdot 3 = 10 \cdot 2 + 5 \cdot 3,\\3x + 2y = 5\end{array} \right.