Find .

I understand the steps in doing this but this one I am having trouble when getting the to the last part...

I start by writing the h

$\displaystyle h(x)=\sqrt[3]8x$ then I get $\displaystyle \frac{\sqrt[3]8x}{\sqrt[3]8x-1}$

Buts it's adding in the last f(x) I am having trouble?