| $$ \begin{aligned}2x^2y+3xy^2-3xy+4x^2y+y^2-5xy^2& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}6x^2y-2xy^2-3xy+y^2\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{2x^2y} + \color{red}{3xy^2} -3xy+ \color{blue}{4x^2y} +y^2 \color{red}{-5xy^2} = \color{blue}{6x^2y} \color{red}{-2xy^2} -3xy+y^2 $$ |