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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
(5*z^2-z^3)/z = 0
5*z^2-z^3 = 0
z^2*(5-z) = 0
5-z = 0 // - 5
-z = -5 // * -1
z = 5
z^2*(z-5) = 0
(z^2*(z-5))/z = 0
( z-5 )
z-5 = 0 // + 5
z = 5
( z^2 )
1*z^2 = 0 // : 1
z^2 = 0
z = 0
z in { 0}
z = 5
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