Factor
\frac{81x^{2}y^{4}-108xy^{2}+28z^{2}x^{4}-48zx^{2}+72zy^{2}x^{3}+36}{36}
Evaluate
2zy^{2}x^{3}+\frac{7z^{2}x^{4}}{9}+\frac{9x^{2}y^{4}}{4}-\frac{4zx^{2}}{3}-3xy^{2}+1
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\frac{28x^{4}z^{2}+81x^{2}y^{4}+36+72x^{3}y^{2}z-48x^{2}z-108xy^{2}}{36}
Factor out \frac{1}{36}.
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