Evaluate
3\sqrt{2}+10\sqrt{7}\approx 30.700153798
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3\sqrt{2}+9\sqrt{7}+\sqrt{7}
Combine 8\sqrt{2} and -5\sqrt{2} to get 3\sqrt{2}.
3\sqrt{2}+10\sqrt{7}
Combine 9\sqrt{7} and \sqrt{7} to get 10\sqrt{7}.
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