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D( x )
((3*x^-2)/8)*y^-5 = 0
x = 0
((3*x^-2)/8)*y^-5 = 0
((3*x^-2)/8)*y^-5 = 0
3/8*x^-2*y^-5 = 0 // : 3/8*y^-5
x^-2 = 0
x należy do O
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(((3*x^-2)/8)*y^-5)^-2 = 0
64/9*x^4*y^10 = 0 // : 64/9*y^10
x^4 = 0
x = 0
x in { 0}
x belongs to the empty set
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