$$ \begin{aligned}8m^2n+6mn+2mn-3n& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}8m^2n+8mn-3n\end{aligned} $$ | |
① | Combine like terms: $$ 8m^2n+ \color{blue}{6mn} + \color{blue}{2mn} -3n = 8m^2n+ \color{blue}{8mn} -3n $$ |