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D( x )
x^4 = 0
x^4 = 0
x^4 = 0
1*x^4 = 0 // : 1
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
(((((x^2)/3)*y^3)/(x^4))/6)*y^5 = 0
1/18*x^-2*y^8 = 0 // : 1/18*y^8
x^-2 = 0
x należy do O
x belongs to the empty set
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