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