3a(a+b+c)−2b(a−b+c)from 4c(−a+b+c)
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4ac+4bc+4c2--3a2+3ab+3ac-2ab+2b2-2bc
=-3a2+2b2+4c2+7ac+2bc+ab
=-3a2+2b2+4c2+7ac+2bc+ab
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