\[\frac{2y^{2} - 5xy}{x^{2} - 4y^{2}} - \frac{x}{2y - x} - \frac{y}{x + 2y} =\]
\[= \frac{x^{2} - 4xy + 4y^{2}}{(x - 2y)(x + 2y)} =\]