Answer
$\frac{13x}{21}$
Work Step by Step
$\frac{x}{3}$ +$\frac{2x}{7}$
=$\frac{x\times7}{3\times7}$ +$\frac{2x\times3}{7\times3}$
=$\frac{7x}{21}$ +$\frac{6x}{21}$
=$\frac{7x + 6x}{21}$
=$\frac{13x}{21}$
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