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-2\left(5\sqrt{3}-\sqrt{147}\right)
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}.
-2\left(5\sqrt{3}-7\sqrt{3}\right)
Factor 147=7^{2}\times 3. Rewrite the square root of the product \sqrt{7^{2}\times 3} as the product of square roots \sqrt{7^{2}}\sqrt{3}. Take the square root of 7^{2}.
-2\left(-2\right)\sqrt{3}
Combine 5\sqrt{3} and -7\sqrt{3} to get -2\sqrt{3}.
4\sqrt{3}
Multiply -2 and -2 to get 4.