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z in (-oo:+oo)
12*z^4-(z^2*((8*z^3)/4)) = 0
12*z^4-2*z^5 = 0
12*z^4-2*z^5 = 0
2*z^4*(6-z) = 0
6-z = 0 // - 6
-z = -6 // * -1
z = 6
2*z^4 = 0
2*z^4 = 0 // : 2
z^4 = 0
z = 0
z in { 6, 0 }
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