To simplify the expression \( \frac{3}{7}x + \frac{2}{7}x \), you can combine the like terms.
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Add the coefficients: \[ \frac{3}{7} + \frac{2}{7} = \frac{3 + 2}{7} = \frac{5}{7} \]
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Combine with \( x \): \[ \frac{5}{7}x \]
So, the simplified expression is: \[ \frac{5}{7}x \]
Thus, the correct response is: \( \frac{5}{7}x \).