\[\frac{x + 3}{7} = \frac{2x - 1}{5}\]
\[5 \cdot (x + 3) = 7 \cdot (2x - 1)\]
\[5x + 15 = 14x - 7\]
\[5x - 14x = - 7 - 15\]
\[- 9x = - 22\]
\[x = 22\ :9 = \frac{22}{9}\]
\[x = 2\frac{4}{9}.\]
\[Ответ:x = 2\frac{4}{9}.\]