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What is the solution of this equation? -1/2n^2 +18 = 0

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-\cfrac{1}{2}n^2 + 18=0\implies -\cfrac{n^2}{2} + 18=0\implies 18=\cfrac{n^2}{2}\implies 36=n^2 \\\\\\ √(36)=n\implies 6=n

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