factorise x-1-(x-1)^2+ax-a
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Given Equation is (x - 1) - (x - 1)^2 + ax - a.
= (x - 1) - (x - 1)^2 + a(x - 1)
= (x - 1)(1 - (x - 1) + a)
= (x - 1)(1 - x + 1 + a)
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