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