factorise a2(b+c)+b2 (c+a)+c2 (a+b)+3abc
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2ab+2ac+ 2bc + 2ba+2ca+2cb+3abc
4ab+4ac+4bc+3abc
4(ab+ac+bc) + 3abc
4ab+4ac+4bc+3abc
4(ab+ac+bc) + 3abc
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