Answer
$-r-\dfrac{11}{2}$
Work Step by Step
$-\dfrac{1}{2}(2r+11)=-\dfrac{1}{2}(2r)+(-\dfrac{1}{2})(11)=(-\dfrac{1*2}{2})(r)+(-\dfrac{1*11}{2})=(-\dfrac{2}{2})(r)-\dfrac{11}{2}=-r-\dfrac{11}{2}$
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