To simplify the expression \( \frac{3}{7}x + \frac{2}{7}x \), we can combine the like terms.
- Both terms have the same denominator (7) and the variable \( x \).
- We can add the coefficients \( 3 \) and \( 2 \):
\[ \frac{3 + 2}{7} x = \frac{5}{7} x \]
Thus, the simplified expression is:
\(\frac{5}{7}x\)
Therefore, the correct response is:
57x (Start Fraction 5 over 7 End Fraction x)