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$\text{$\dfrac{-7}{6}$ + $\dfrac{18}{6}$ = $\dfrac{-7 + 18}{6}$ = $\dfrac{18 - 7}{6}$ = $\dfrac{11}{6}$}$
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$\text{$\dfrac{-7}{6}$ + $\dfrac{18}{6}$ = $\dfrac{-7 + 18}{6}$ = $\dfrac{18 - 7}{6}$ = $\dfrac{11}{6}$}$