$$ \begin{aligned}6(2b+6)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}12b+36\end{aligned} $$ | |
① | Multiply $ \color{blue}{6} $ by $ \left( 2b+6\right) $ $$ \color{blue}{6} \cdot \left( 2b+6\right) = 12b+36 $$ |