2 2 2 9*y*y z *x - ------ 100
z^2*x^2 - (9*y)*y^2/100
3 9*y 2 2 - ---- + x *z 100
-9*y^3/100 + x^2*z^2
-0.09*y^3 + x^2*z^2
3 2 2 - 9*y + 100*x *z ------------------ 100
(-9*y^3 + 100*x^2*z^2)/100