| $$ \begin{aligned}\frac{6\sqrt{2}}{-6}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{\sqrt{2}}{-1} \xlongequal{ } \\[1 em] & \xlongequal{ }-\frac{\sqrt{2}}{1} \xlongequal{ } \\[1 em] & \xlongequal{ }-\sqrt{2}\end{aligned} $$ | |
| ① | Divide both numerator and denominator by 6. |