| $$ \begin{aligned}\frac{21+sqrt-18}{3}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{qrst+3}{3}\end{aligned} $$ | |
| ① | Simplify numerator $$ \color{blue}{21} +qrst \color{blue}{-18} = qrst+ \color{blue}{3} $$ |