\[\left\{ \begin{matrix} 2x - 3 \leq 17\ \ \ \ \ \ \\ 14 + 3x > - 13 \\ \end{matrix} \right.\ \]
\[\left\{ \begin{matrix} 2x \leq 20\ \ \ \\ 3x > - 27 \\ \end{matrix} \right.\ \]
\[\left\{ \begin{matrix} x \leq 10 \\ x > - 9 \\ \end{matrix} \right.\ \]
\[x = - 8\ (наим);\ \ x = 10\ (наиб)\]
\[10 - ( - 8) = 18.\]
\[Ответ:на\ 18.\]