Evaluate
2\sqrt{7}-1\approx 4.291502622
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3\sqrt{7}+2-3-\sqrt{7}
Combine 2\sqrt{7} and \sqrt{7} to get 3\sqrt{7}.
3\sqrt{7}-1-\sqrt{7}
Subtract 3 from 2 to get -1.
2\sqrt{7}-1
Combine 3\sqrt{7} and -\sqrt{7} to get 2\sqrt{7}.
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