\[y = \frac{4x^{2} + 12x + 9}{2x + 3} - \frac{x^{2} + 5x}{x} =\]
\[= \frac{(2x + 3)^{2}}{2x + 3} - \frac{x(x + 5)}{x} =\]
\[= 2x + 3 - x - 5 = x - 2,\]
\[x \neq - 1,5;\ \ x \neq 0.\]