Question 318214
(3y^2-12)/(y^2+4y+4) / (y^3-2y^2)/(y^2+2y) 
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3(y^2-4)/(y+2)^2   /   y^2(y-2)/y(y+2)
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3(y+2)(y-2) /(y+2)^2  * y(y+2)/y^2(y-2)
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3(y+2)(y-2)*y(y+2) / (y+2)^2*y^2(y-2)
3/y