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z in (-oo:+oo)
4*z^2-(z^2*((6*z^5)/2)) = 0
4*z^2-3*z^7 = 0
4*z^2-3*z^7 = 0
z^2*(4-3*z^5) = 0
-3*z^5 = -4 // : -3
z^5 = 4/3
z^5 = 4/3 // ^ 1/5
z = (4/3)^(1/5)
z^2 = 0
1*z^2 = 0 // : 1
z^2 = 0
z = 0
z in { (4/3)^(1/5), 0 }
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