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3\sqrt{3}-5\sqrt{2}+4\times 6\sqrt{2}-2\sqrt{18}
Factor 72=6^{2}\times 2. Rewrite the square root of the product \sqrt{6^{2}\times 2} as the product of square roots \sqrt{6^{2}}\sqrt{2}. Take the square root of 6^{2}.
3\sqrt{3}-5\sqrt{2}+24\sqrt{2}-2\sqrt{18}
Multiply 4 and 6 to get 24.
3\sqrt{3}+19\sqrt{2}-2\sqrt{18}
Combine -5\sqrt{2} and 24\sqrt{2} to get 19\sqrt{2}.
3\sqrt{3}+19\sqrt{2}-2\times 3\sqrt{2}
Factor 18=3^{2}\times 2. Rewrite the square root of the product \sqrt{3^{2}\times 2} as the product of square roots \sqrt{3^{2}}\sqrt{2}. Take the square root of 3^{2}.
3\sqrt{3}+19\sqrt{2}-6\sqrt{2}
Multiply -2 and 3 to get -6.
3\sqrt{3}+13\sqrt{2}
Combine 19\sqrt{2} and -6\sqrt{2} to get 13\sqrt{2}.