Answer
$$-\frac{12}{2}m-1=-6m-1$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}-\frac{12}{2}m-1& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-\frac{ 12 : \color{orangered}{ 2 } }{ 2 : \color{orangered}{ 2 }} \cdot m - 1 \xlongequal{ } \\[1 em] & \xlongequal{ }-\frac{6}{1}m-1 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-6m-1\end{aligned} $$ | |
| ① | Divide both the top and bottom numbers by $ \color{orangered}{ 2 } $. |
| ② | Remove 1 from denominator. |
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