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D( z )
3*z^2 = 0
3*z^2 = 0
3*z^2 = 0
3*z^2 = 0 // : 3
z^2 = 0
z = 0
z in (-oo:0) U (0:+oo)
(6*z^6-(24*z^5))/(3*z^2) = 0
(6*z^6-24*z^5)/(3*z^2) = 0
6*z^6-24*z^5 = 0
6*z^5*(z-4) = 0
z-4 = 0 // + 4
z = 4
6*z^5*(z-4) = 0
(6*z^5*(z-4))/(3*z^2) = 0
( 6*z^5 )
6*z^5 = 0 // : 6
z^5 = 0
z = 0
( z-4 )
z-4 = 0 // + 4
z = 4
z in { 0}
z = 4
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