subtract : 3a ( a+b+c) -2b (a-b+c ) from 4c (-a+b+c)
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4c(-a+b+c)-[3a(a+b+c)-2b(a-b+c)]
4c(-a+b+c)-[3a^3+3ab+3ac-2ab+2b^2-2bc]
4c(-a+b+c)-[3a^2+2b^2+ab+3ac-2bc]
-4c+4bc+4c^2-3a^2-2b^2-ab-3ac+2bc
4c^2-3a^2-2b^2-ab+6bc-7ac
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