Simplify the following expression completely.

12a^{2} - 3b^{2 }= 3(2a +b)(2a-b)2a^{2}-ab-b^{2 }= 2a(a-b)+b(a-b)3(2a +b)(2a-b)2a(a-b)+b(a-b) =3(2a-b) a-b= ^{3(2a-b)}/_{a-b}

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