c2-a2-ab+bc =(a-c)(a+b+c) how?
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c²-a²-ab+bc=(c+a)(c-a)+b(-a+c)
(c-a){(c+a)*1+b)}
(c-a)(c+a+b)
(c-a){(c+a)*1+b)}
(c-a)(c+a+b)
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