\[\frac{4x - 10}{x^{2} - 5xy} - \frac{4y - 2}{xy - 5y^{2}} =\]
\[= \frac{4x - 10}{x(x - 5y)} - \frac{4y - 2}{y(x - 5y)} =\]
\[= \frac{2x - 10y}{\text{xy}(x - 5y)} =\]