\[\left( x + 5 + \frac{25}{x + 5} \right) \cdot \frac{x - 5}{x^{2}} =\]
\[= \frac{\left( x^{2} - 25 + 25 \right)}{x - 5} \cdot \frac{x - 5}{x^{2}} =\]
\[= \frac{x^{2}(x - 5)}{(x - 5) \cdot x^{2}} = 1 \Longrightarrow ч.т.д.\ \ \]
\[x \neq 5;0.\]