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z in (-oo:+oo)
12*z^6-(z^2*((16*z^5)/4)) = 0
12*z^6-4*z^7 = 0
12*z^6-4*z^7 = 0
4*z^6*(3-z) = 0
3-z = 0 // - 3
-z = -3 // * -1
z = 3
4*z^6 = 0
4*z^6 = 0 // : 4
z^6 = 0
z = 0
z in { 3, 0 }
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