TeX source:

\begin{aligned} &\frac{3 x \cdot(x-2) \cdot h}{3 x}=\frac{3 x^{4}-3 x^{3}-33 x^{2}+54 x}{3 x} \\ &(x-2) h=x^{3}-x^{2}-11 x+18 \end{aligned}