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D( x )
x^3 = 0
x^3 = 0
x^3 = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x in (-oo:0) U (0:+oo)
((X^2*z^5)/(x^3))*z^5 = 0
X^2*x^-3*z^10 = 0 // : X^2*z^10
x^-3 = 0
x należy do O
x belongs to the empty set
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