Answer
$\frac{21x}{35}$
Work Step by Step
LCD is 35.
$\frac{11x}{35}+\frac{2x}{7}=\frac{11x}{35}+\frac{2x\times5}{7\times5}=\frac{11x}{35}+\frac{10x}{35}=\frac{11x+10x}{35}=\frac{21x}{35}$
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