\[y = \frac{2x^{2} + 5x}{x} - \frac{x^{2} - 9}{x - 3} =\]
\[= \frac{x(2x + 5)}{x} - \frac{(x - 3)(x + 3)}{x - 3} =\]
\[= 2x + 5 - (x + 3) =\]
\[= 2x + 5 - x - 3 = x + 2;\]
\[x \neq 0;\ \ x \neq 3.\]