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D( x )
x = 0
x^-5 = 0
x = 0
x = 0
x^-5 = 0
x^-5 = 0
1*x^-5 = 0 // : 1
x^-5 = 0
x należy do O
x in (-oo:0) U (0:+oo)
(((x^5*y^-5)^2)/(x^-5))*y^3 = 0
x^15*y^-7 = 0 // : y^-7
x^15 = 0
x = 0
x in { 0}
x belongs to the empty set
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