Evaluate
6\sqrt{7}+\sqrt[4]{11}\approx 17.695668153
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6\sqrt{7}-8\sqrt[4]{11}+9\sqrt[4]{11}
Combine 5\sqrt{7} and \sqrt{7} to get 6\sqrt{7}.
6\sqrt{7}+\sqrt[4]{11}
Combine -8\sqrt[4]{11} and 9\sqrt[4]{11} to get \sqrt[4]{11}.
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