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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^6)/(x^3))*z^6 = 0
x^-1*z^12 = 0 // : z^12
x^-1 = 0
x należy do O
x belongs to the empty set
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