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D( x )
x^3 = 0
x = 0
x^3 = 0
x^3 = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((x^-4*y^-5)/(x^3))*y^-4 = 0
x^-7*y^-9 = 0 // : y^-9
x^-7 = 0
x należy do O
x belongs to the empty set
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