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