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D( x )
35*Y^4*x^5 = 0
x = 0
35*Y^4*x^5 = 0
35*Y^4*x^5 = 0
35*Y^4*x^5 = 0 // : 35*Y^4
x^5 = 0
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(25*Y^2*x^-3)/(35*Y^4*x^5) = 0
5/7*Y^-2*x^-8 = 0 // : 5/7*Y^-2
x^-8 = 0
x należy do O
x belongs to the empty set
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