\[\frac{y^{2} - 49}{y^{2} + 5y - 14} =\]
\[= \frac{(y - 7)(y + 7)}{(y - 2)(y + 7)} = \frac{y - 7}{y - 2}\]
\[y^{2} + 5y - 14 = 0\]
\[y_{1} + y_{2} = - 5;\ \ \ \ y_{1} \cdot y_{2} = - 14\]
\[y_{1} = - 7;\ \ \ y_{2} = 2.\]