The standard form of an ellipse equation is $\frac{(x-h)^2}{a^2} + \frac{(y-k)^2}{b^2} = 1$, where $(h,k)$ is the center of the ellipse, and $a$ and $b$ are the semi-major and semi-minor axes respectively.
The given equation is $9x^2 - 54x + 9y^2 - 54y + 81 =
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