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D( x )
(x^3)^5 = 0
(x^3)^5 = 0
(x^3)^5 = 0
1*x^15 = 0 // : 1
x^15 = 0
x = 0
x in (-oo:0) U (0:+oo)
((x^4)^2)/((x^3)^5) = 0
1*x^-7 = 0 // : 1
x^-7 = 0
x należy do O
x belongs to the empty set
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