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D( x )
((8*x^9)/4)*z^4 = 0
((8*x^9)/4)*z^4 = 0
((8*x^9)/4)*z^4 = 0
2*x^9*z^4 = 0 // : 2*z^4
x^9 = 0
x = 0
x in (-oo:0) U (0:+oo)
(((8*x^9)/4)*z^4)^-2 = 0
1/4*x^-18*z^-8 = 0 // : 1/4*z^-8
x^-18 = 0
x należy do O
x belongs to the empty set
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