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5\times 3\sqrt{2}+\sqrt{50}-\sqrt{125}+3\sqrt{5}
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}.
15\sqrt{2}+\sqrt{50}-\sqrt{125}+3\sqrt{5}
Multiply 5 and 3 to get 15.
15\sqrt{2}+5\sqrt{2}-\sqrt{125}+3\sqrt{5}
Factor 50=5^{2}\times 2. Rewrite the square root of the product \sqrt{5^{2}\times 2} as the product of square roots \sqrt{5^{2}}\sqrt{2}. Take the square root of 5^{2}.
20\sqrt{2}-\sqrt{125}+3\sqrt{5}
Combine 15\sqrt{2} and 5\sqrt{2} to get 20\sqrt{2}.
20\sqrt{2}-5\sqrt{5}+3\sqrt{5}
Factor 125=5^{2}\times 5. Rewrite the square root of the product \sqrt{5^{2}\times 5} as the product of square roots \sqrt{5^{2}}\sqrt{5}. Take the square root of 5^{2}.
20\sqrt{2}-2\sqrt{5}
Combine -5\sqrt{5} and 3\sqrt{5} to get -2\sqrt{5}.