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)]
=-4ac+4bc+4c²-[3a²+3ab+3ac-2ab+2b²-2bc]
=-4ac+4bc+4c²-3a²-3ab-3ac+2ab-2b²+2bc
write like terms at one place
=-4ac-3ac+4bc+2bc+4c²-3a²-2b²-3ab+2ab
=-7ac+6bc-ab+4c²-3a²-2b²...
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