Answer
$$2b+3a-c+a-4b+2c=4a-2b+c$$
Explanation
| $$ \begin{aligned}2b+3a-c+a-4b+2c& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}4a-2b+c\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{2b} + \color{red}{3a} \color{green}{-c} + \color{red}{a} \color{blue}{-4b} + \color{green}{2c} = \color{red}{4a} \color{blue}{-2b} + \color{green}{c} $$ |
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