(d) Subtract: 3a (a+b+c)-2 b(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)−[3a2+3ab+3ac−2ab+2b2−2bc]
4c(−a+b+c)−[3a2+2b2+ab+3ac−2bc]
−4ac+4bc+4c2−3a2−2b2−ab−3ac+2bc
4c2−3a2−2b2−ab+6bc−7ac
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