| $$ \begin{aligned}\frac{20m^2+28m}{8m^2-49m^2}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{20m^2+28m}{-41m^2}\end{aligned} $$ | |
| ① | Simplify denominator $$ \color{blue}{8m^2} \color{blue}{-49m^2} = \color{blue}{-41m^2} $$ |