Answer
$$3x-4x+9x=8x$$
Explanation
| $$ \begin{aligned}3x-4x+9x& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}8x\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{3x} \color{red}{-4x} + \color{red}{9x} = \color{red}{8x} $$ |
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