\[\left\{ \begin{matrix}
3 > 5x - a \\
- 3 < 3x + a \\
\end{matrix} \right.\ \text{\ \ \ \ \ \ \ \ \ \ }\]
\[\left\{ \begin{matrix}
5x < a + 3\ \ \ \ \\
3x > - a - 3 \\
\end{matrix} \right.\ \text{\ \ \ \ \ \ \ }\]
\[\left\{ \begin{matrix}
x < \frac{a + 3}{5}\text{\ \ \ } \\
x > \frac{- a - 3}{3} \\
\end{matrix} \right.\ \]
\(\text{\ \ \ \ \ \ \ \ \ \ }\)
\[Число\ 2 - решение\ при:\]
\[\frac{- a - 3}{3} < 2 < \frac{a + 3}{5}\]
\[\left\{ \begin{matrix}
\frac{a + 3}{5} > 2\ \ \ \\
\frac{- a - 3}{3} < 2 \\
\end{matrix} \right.\ \text{\ \ \ \ \ \ \ \ \ }\]
\[\left\{ \begin{matrix}
a + 3 > 10 \\
- a - 3 < 6 \\
\end{matrix} \right.\ \text{\ \ \ \ \ \ \ \ \ }\]
\[\left\{ \begin{matrix}
a > 7\ \ \ \ \\
a > - 9 \\
\end{matrix} \right.\ \]

\[Ответ:при\ a \in (7; + \infty).\]