Evaluate
-\frac{\sqrt{6}}{2}\approx -1.224744871
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2\sqrt{6}-\frac{5}{2}\sqrt{6}
Combine \frac{1}{2}\sqrt{6} and \frac{3}{2}\sqrt{6} to get 2\sqrt{6}.
-\frac{1}{2}\sqrt{6}
Combine 2\sqrt{6} and -\frac{5}{2}\sqrt{6} to get -\frac{1}{2}\sqrt{6}.
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