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2\times 3\sqrt{6}-3\sqrt{27}+3\sqrt{3}
Factor 54=3^{2}\times 6. Rewrite the square root of the product \sqrt{3^{2}\times 6} as the product of square roots \sqrt{3^{2}}\sqrt{6}. Take the square root of 3^{2}.
6\sqrt{6}-3\sqrt{27}+3\sqrt{3}
Multiply 2 and 3 to get 6.
6\sqrt{6}-3\times 3\sqrt{3}+3\sqrt{3}
Factor 27=3^{2}\times 3. Rewrite the square root of the product \sqrt{3^{2}\times 3} as the product of square roots \sqrt{3^{2}}\sqrt{3}. Take the square root of 3^{2}.
6\sqrt{6}-9\sqrt{3}+3\sqrt{3}
Multiply -3 and 3 to get -9.
6\sqrt{6}-6\sqrt{3}
Combine -9\sqrt{3} and 3\sqrt{3} to get -6\sqrt{3}.