\begin{exerciseStatement}
Find the largest interval for which the Existence and Uniqueness Theorem for Linear IVPs guarantees a unique solution for the following IVP.
\[ e^{\left(2 \, t\right)} = -{y'} {\left(t + 6\right)} {\left(t - 5\right)} - {y} t e^{t} \hspace{2em}
x( 3 )= -9 \]
\end{exerciseStatement}
\begin{exerciseAnswer}
\[(-6,5)\]
\end{exerciseAnswer}