Evaluate
3\left(2\sqrt{2}-\sqrt{7}\right)\approx 0.548027441
Factor
3 {(2 \sqrt{2} - \sqrt{7})} = 0.548027441
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6\sqrt{2}-3\sqrt{7}
Combine 3\sqrt{2} and 3\sqrt{2} to get 6\sqrt{2}.
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