Answer
$$8m^2-6mn-12-3m^2+mn+7=5m^2-5mn-5$$
Explanation
| $$ \begin{aligned}8m^2-6mn-12-3m^2+mn+7& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}5m^2-5mn-5\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{8m^2} \color{red}{-6mn} \color{green}{-12} \color{blue}{-3m^2} + \color{red}{mn} + \color{green}{7} = \color{blue}{5m^2} \color{red}{-5mn} \color{green}{-5} $$ |
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