| $$ \begin{aligned}10q(16x+11)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}160qx+110q\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{10q} $ by $ \left( 16x+11\right) $ $$ \color{blue}{10q} \cdot \left( 16x+11\right) = 160qx+110q $$ |