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D( x )
6*x^3 = 0
6*x^3 = 0
6*x^3 = 0
6*x^3 = 0 // : 6
x^3 = 0
x = 0
x in (-oo:0) U (0:+oo)
((6*x^3)^-3)/y = 0
1/216*x^-9*y^-1 = 0 // : 1/216*y^-1
x^-9 = 0
x należy do O
x belongs to the empty set
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