разложите на множители: ac^2-с^2-ac+c
ac^2-c^-ac+c=c^2(a-1)-c(a-1)=(a-1)(c^-c)=c(c-1)(a-1)
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ac^2-c^-ac+c=c^2(a-1)-c(a-1)=(a-1)(c^-c)=c(c-1)(a-1)