Answer
$$6x^2-3x+3x^2+x-1=9x^2-2x-1$$
Explanation
| $$ \begin{aligned}6x^2-3x+3x^2+x-1& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}9x^2-2x-1\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{6x^2} \color{red}{-3x} + \color{blue}{3x^2} + \color{red}{x} -1 = \color{blue}{9x^2} \color{red}{-2x} -1 $$ |
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