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-\frac{21}{3}+\frac{1}{3}
Convert -7 to fraction -\frac{21}{3}.
\frac{-21+1}{3}
Since -\frac{21}{3} and \frac{1}{3} have the same denominator, add them by adding their numerators.
-\frac{20}{3}
Add -21 and 1 to get -20.