\[\frac{x^{2} + 20}{x^{2} - 4} = \frac{x - 3^{\backslash x\text{-}2}}{x + 2} - \frac{6^{\backslash x + 2}}{2 - x}\]
\[\frac{x^{2} + 20}{(x - 2)(x + 2)} =\]
\[= \frac{(x - 3)(x - 2) + 6 \cdot (x + 2)}{(x - 2)(x + 2)};\ \ \]
\[x \neq 2,\ x \neq - 2\]
\[20 + 2x + 3x - 6 - 6x - 12 = 0\]
\[- x + 2 = 0\]
\[x = 2\ (не\ подходит).\]
\[Ответ:нет\ решения.\]