Simplify exactly. Give your answer as a single rational expression of lowest terms.
−5cos(30∘)+7csc(30∘)=\displaystyle -{5}{\cos{{\left({30}^{\circ}\right)}}}+{7}{\csc{{\left({30}^{\circ}\right)}}}=−5cos(30∘)+7csc(30∘)=
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