$$ \begin{aligned}8x^3-9y+16x^3+12y& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}24x^3+3y\end{aligned} $$ | |
① | Combine like terms: $$ \color{blue}{8x^3} \color{red}{-9y} + \color{blue}{16x^3} + \color{red}{12y} = \color{blue}{24x^3} + \color{red}{3y} $$ |