$$ \begin{aligned}x+3xy+y+16-5x-4xy& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-xy-4x+y+16\end{aligned} $$ | |
① | Combine like terms: $$ \color{blue}{x} + \color{red}{3xy} +y+16 \color{blue}{-5x} \color{red}{-4xy} = \color{red}{-xy} \color{blue}{-4x} +y+16 $$ |