| $$ \begin{aligned}\frac{36y^2+36y}{-32y-16y}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{36y^2+36y}{-48y}\end{aligned} $$ | |
| ① | Simplify denominator $$ \color{blue}{-32y} \color{blue}{-16y} = \color{blue}{-48y} $$ |