Answer
$$z+z\cdot2=3z$$
Explanation
| $$ \begin{aligned}z+z\cdot2& \xlongequal{ }z+2z \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}3z\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{z} + \color{blue}{2z} = \color{blue}{3z} $$ |
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