Question 422931
Well, you can multiply every term by the LCD {{{y^3}}} to get 



{{{zy^3=4xy^3-12x^2y^2+16x^3y-8x^4}}}



and then you can isolate z by dividing both sides by {{{y^3}}} to get



{{{z=(4xy^3-12x^2y^2+16x^3y-8x^4)/(y^3)}}}



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