To simplify \( \frac{3}{7}x + \frac{2}{7}x \), you can combine the fractions since they have the same denominator:
\[ \frac{3}{7}x + \frac{2}{7}x = \left(\frac{3 + 2}{7}\right)x = \frac{5}{7}x \]
So, the simplified expression is \( \frac{5}{7}x \).
The correct response is:
5/7x