TeX джерело:

\left\{ \begin{array}{l}a - b = 2,\\a2 - b2 = 8;\end{array} \right.\;\left\{ \begin{array}{l}a - b = 2,\\(a - b)(a + b) = 8;\end{array} \right.\;\left\{ \begin{array}{l}a - b = 2,\\2(a + b) = 8;\end{array} \right.\;\left\{ \begin{array}{l}a - b = 2,\\a + b = 4;\end{array} \right.\;\left\{ \begin{array}{l}2a = 6,\\2b = 2;\end{array} \right.\;\left\{ \begin{array}{l}a = 3,\\b = 1.\end{array} \right.