| $$ \begin{aligned}5v^2-80v^2-7v+12& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-75v^2-7v+12\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{5v^2} \color{blue}{-80v^2} -7v+12 = \color{blue}{-75v^2} -7v+12 $$ |