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