\[\frac{9y + 1}{y^{2} - 4} - \frac{y - 8}{4 - y^{2}} + \frac{1 - 7y}{y^{2} - 4} =\]
\[= \frac{9y + 1}{y^{2} - 4} + \frac{y - 8}{y^{2} - 4} + \frac{1 - 7y}{y^{2} - 4} =\]
\[= \frac{9y + 1 + y - 8 + 1 - 7y}{y^{2} - 4} =\]
\[= \frac{3y - 6}{y^{2} - 4} = \frac{3(y - 2)}{(y - 2)(y + 2)} =\]
\[= \frac{3}{y + 2}.\]