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x in (-oo:+oo)
(((((2*x^3)/2)*y^-3)/2)*z^3)/4-((((((5*x^1)/2)*y^-5)/2)*z^7)/4) = 0
(-5/16)*x*y^-5*z^7+(((((2*x^3)/2)*y^-3)/2)*z^3)/4 = 0
1/8*x^3*y^-3*z^3-5/16*x*y^-5*z^7 = 0
1/8*x*y^-3*z^3*(x^2-5/2*y^-2*z^4) = 0
1*x^2 = -(-5/2*y^-2*z^4) // : 1
x^2 = 5/2*y^-2*z^4
x^2 = 5/2*y^-2*z^4 // ^ 1/2
abs(x) = (5/2)^(1/2)*y^-1*z^2
x = (5/2)^(1/2)*y^-1*z^2 or x = -((5/2)^(1/2)*y^-1*z^2)
(x*z^3)/(8*y^3) = 0
1/8*x*y^-3*z^3 = 0 // : 1/8*y^-3*z^3
x = 0
x in { (5/2)^(1/2)*y^-1*z^2, -((5/2)^(1/2)*y^-1*z^2), 0 }
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