| $$ \begin{aligned}t^2+4+2t^2+6& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}3t^2+10\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{t^2} + \color{red}{4} + \color{blue}{2t^2} + \color{red}{6} = \color{blue}{3t^2} + \color{red}{10} $$ |