Answer
$$x+x^1+x^2+x^3+x^4+x^6=x^6+x^4+x^3+x^2+2x$$
Explanation
| $$ \begin{aligned}x+x^1+x^2+x^3+x^4+x^6& \xlongequal{ }x+x+x^2+x^3+x^4+x^6 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}x^6+x^4+x^3+x^2+2x\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{x} + \color{blue}{x} +x^2+x^3+x^4+x^6 = x^6+x^4+x^3+x^2+ \color{blue}{2x} $$ |
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