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-\frac{21}{2}+\frac{8}{2}
Convert 4 to fraction \frac{8}{2}.
\frac{-21+8}{2}
Since -\frac{21}{2} and \frac{8}{2} have the same denominator, add them by adding their numerators.
-\frac{13}{2}
Add -21 and 8 to get -13.