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(x^2)/6-((5*z)/2)-9 = 0
(x^2)/6+(-5/2)*z-9 = 0
1/6*x^2 = -(-5/2*z-9) // : 1/6
x^2 = 6*(9-(-5/2*z))
x^2 = 6*(5/2*z+9) // ^ 1/2
abs(x) = 6^(1/2)*(5/2*z+9)^(1/2)
x = 6^(1/2)*(5/2*z+9)^(1/2) or x = -(6^(1/2)*(5/2*z+9)^(1/2))
x in { 6^(1/2)*(5/2*z+9)^(1/2), -(6^(1/2)*(5/2*z+9)^(1/2)) }
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