Question
Answer
$$3(x+3)=3x+9$$
Explanation
| $$ \begin{aligned}3(x+3)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}3x+9\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{3} $ by $ \left( x+3\right) $ $$ \color{blue}{3} \cdot \left( x+3\right) = 3x+9 $$ |
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