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10\sqrt{3}-7\times 5\sqrt{3}+2\sqrt{243}
Factor 75=5^{2}\times 3. Rewrite the square root of the product \sqrt{5^{2}\times 3} as the product of square roots \sqrt{5^{2}}\sqrt{3}. Take the square root of 5^{2}.
10\sqrt{3}-35\sqrt{3}+2\sqrt{243}
Multiply -7 and 5 to get -35.
-25\sqrt{3}+2\sqrt{243}
Combine 10\sqrt{3} and -35\sqrt{3} to get -25\sqrt{3}.
-25\sqrt{3}+2\times 9\sqrt{3}
Factor 243=9^{2}\times 3. Rewrite the square root of the product \sqrt{9^{2}\times 3} as the product of square roots \sqrt{9^{2}}\sqrt{3}. Take the square root of 9^{2}.
-25\sqrt{3}+18\sqrt{3}
Multiply 2 and 9 to get 18.
-7\sqrt{3}
Combine -25\sqrt{3} and 18\sqrt{3} to get -7\sqrt{3}.