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