\(15.\sqrt{4x-12}+2\sqrt{9x-27}-\sqrt{36}=\sqrt{25x-75}\\ \sqrt{4\left(x-3\right)}+2\sqrt{9\left(x-3\right)}-6=\sqrt{25\left(x-3\right)}\\ 2\sqrt[]{x-3}+6\sqrt{x-3}-6-5\sqrt{x-3}\\ =3\sqrt{x-3}-6\)
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