Worked Solution #4 of 5, increasing in difficulty.

Expand the following:

\begin{align} \quad\quad\quad\quad\quad\quad\quad\quad\Large \frac{x^4 \ y^6 \ z^3}{x^2 \ y^3 \ z^6}\\ \\ &\cssId{Step1}{\Large = { x^{4} \ y^{6} \ z^{3} \ x^{-2} \ y^{-3} \ z^{-6}} }\\ \\ &\cssId{Step2}{\Large = { x^{4} \ x^{-2} \ y^{6} \ y^{-3} \ z^{3} \ z^{-6}} }\\ \\ &\cssId{Step3}{\Large = { x^{4-2} \ y^{6-3} \ z^{3-6} } }\\ \\ &\cssId{Step4}{\Large = { x^{2} \ y^{3} \ z^{-3} }}\\ \\ \end{align}