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D( z )
z^2*((24*z^11)/8) = 0
z^2*((24*z^11)/8) = 0
z^2*((24*z^11)/8) = 0
3*z^13 = 0 // : 3
z^13 = 0
z = 0
z in (-oo:0) U (0:+oo)
(z^2*((24*z^11)/8))^-3 = 0
1/27*z^-39 = 0 // : 1/27
z^-39 = 0
z należy do O
z belongs to the empty set
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