193. Find the values of $x$ for which the numbers $\frac{x-3}{7}$ and $\frac{x-2}{5}$ are both integers.
193. $\left\{\begin{array}{l}\frac{x-3}{7}=y \\ \frac{x-2}{5}=z\end{array}\right.$

Answer. $x=35 t+17$.