\[\frac{x}{2} + \frac{x}{8} = \frac{17}{4}\ \ \ \ \ | \cdot 8\]
\[4x + x = 34\]
\[5x = 34\]
\[x = \frac{34}{5} = 6\frac{4}{5}\]
\[x = 6,8\]
\[Ответ:x = 6,8.\]