Abc+2ba+3ac,4ca-4ab+2bc and 2ab-3abc-6ac
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abc+2ba+3ac,4ca-4ab+2bc &2ab-3abc-6a
=(abc +2ba +3ac)+(4ca-4ab+2bc)+(2ab-3abc-6ac)
=abc+2ba+3ac+4ca-4ab+2bc+2ab-3abc-6ac
= -2ab +2b +2ac +4ab+2bc
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