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2\sqrt{3}-\sqrt{243}-\sqrt{75}
Factor 12=2^{2}\times 3. Rewrite the square root of the product \sqrt{2^{2}\times 3} as the product of square roots \sqrt{2^{2}}\sqrt{3}. Take the square root of 2^{2}.
2\sqrt{3}-9\sqrt{3}-\sqrt{75}
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}.
-7\sqrt{3}-\sqrt{75}
Combine 2\sqrt{3} and -9\sqrt{3} to get -7\sqrt{3}.
-7\sqrt{3}-5\sqrt{3}
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}.
-12\sqrt{3}
Combine -7\sqrt{3} and -5\sqrt{3} to get -12\sqrt{3}.