[tex]3\sqrt{27} - 3\sqrt{12} = 3\sqrt{9*3} -3\sqrt{4*3} =3*3\sqrt{3} -2*3\sqrt{3} =9\sqrt{3}-6\sqrt{3} =3\sqrt{3}[/tex]
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[tex]3\sqrt{27} - 3\sqrt{12} = 3\sqrt{9*3} -3\sqrt{4*3} =3*3\sqrt{3} -2*3\sqrt{3} =9\sqrt{3}-6\sqrt{3} =3\sqrt{3}[/tex]