Answer
-$\frac{13x}{14}$
Work Step by Step
-$\frac{13x}{28}$ - $\frac{13x}{28}$
= $\frac{-13x -13x}{28}$
=$\frac{-26x}{28}$
=-$\frac{2\times13x}{2\times14}$
= -$\frac{13x}{14}$
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