| $$ \begin{aligned}2x^5+3x^2+10+4x^3-10x^2+2& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}2x^5+4x^3-7x^2+12\end{aligned} $$ | |
| ① | Combine like terms: $$ 2x^5+ \color{blue}{3x^2} + \color{red}{10} +4x^3 \color{blue}{-10x^2} + \color{red}{2} = 2x^5+4x^3 \color{blue}{-7x^2} + \color{red}{12} $$ |