| $$ \begin{aligned}2x^2-x^2& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}x^2\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{2x^2} \color{blue}{-x^2} = \color{blue}{x^2} $$ |