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