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z=4x^4-6x^2-9y^4+9y^2+10 canonical form

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             2      4      2      4    
-10 + z - 9*y  - 4*x  + 6*x  + 9*y  = 0
$$- 4 x^{4} + 6 x^{2} + 9 y^{4} - 9 y^{2} + z - 10 = 0$$
-4*x^4 + 6*x^2 + 9*y^4 - 9*y^2 + z - 10 = 0