36b^2/5b^2-20b+20*5b-10/6b.
(36b^2) / (5b^2 - 20b + 20) * (5b-10)/6b =36b^2/5(b-2)(b-2) * 5(b-2)/6b = 5*36b^2(b-2) / 5*6b(b-2)(b-2) = 6b/(b-2)
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