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D( z )
z^3*((12*z^9)/4) = 0
z^3*((12*z^9)/4) = 0
z^3*((12*z^9)/4) = 0
3*z^12 = 0 // : 3
z^12 = 0
z = 0
z in (-oo:0) U (0:+oo)
(z^3*((12*z^9)/4))^-4 = 0
1/81*z^-48 = 0 // : 1/81
z^-48 = 0
z należy do O
z belongs to the empty set
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