\[\frac{y - 20^{\backslash y}}{4y} + \frac{5y - 2^{\backslash 4}}{y^{2}} =\]
\[= \frac{y^{2} - 20y + 20y - 8}{4y^{2}} =\]
\[= \frac{y^{2} - 8}{4y^{2}}.\]