\[= \frac{17 + 8y}{y + 4} - \frac{5y + 5}{y + 4} =\]
\[= \frac{17 + 8y - 5y - 5}{y + 4} =\]
\[Дополнительные\ вычисления:\]
\[2y² + 7y - 4 = 0\]
\[D = 49 + 32 = 81\]
\[y_{1} = \frac{- 7 + 9}{4} = \frac{1}{2};\ \ \ \]
\[y_{2} = \frac{- 7 - 9}{4} = - 4.\]
\[2y^{2} + 7y - 4 =\]
\[= 2 \cdot \left( y - \frac{1}{2} \right)(y + 4) =\]
\[= (2y - 1)(y + 4).\]