Can't see any difference between this question and this one.
However, we need 9th root of unity, which we call [math]\alpha[/math].
Note that [math]\displaystyle \alpha = e^{\displaystyle \frac {2i\pi}9}[/math]
Then [math]x=a(9^{\frac x9})[/math], where [math]a\in \left \{1,\alpha, \alpha^2,\cdots,\alpha^8 \right\}[/math]
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