| $$ \begin{aligned}3j^4k-2jk^3+jk^3-2j^4k+jk^3& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}j^4k\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{3j^4k} \color{red}{-2jk^3} + \color{green}{jk^3} \color{blue}{-2j^4k} + \color{green}{jk^3} = \color{blue}{j^4k} $$ |