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ok thank you
=[2(w^2-4)] / (w^2-2w+w-2)
=[2(w^2-2^2)] / [w(w-2)+1(w-2)]
=[2(w+2)(w-2)] / [(w-2)(w+1)]
w-2 shall be cancelled
=2(w+2) / (w+1)
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