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D( x )
25*y^0*x^-10 = 0
x = 0
25*y^0*x^-10 = 0
25*y^0*x^-10 = 0
25*x^-10 = 0
25*x^-10 = 0 // : 25
x^-10 = 0
x należy do O
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(5*x^0*y^7)/(25*y^0*x^-10) = 0
(5*y^7)/(25*x^-10) = 0
1/5*x^10*y^7 = 0 // : 1/5*y^7
x^10 = 0
x = 0
x in { 0}
x belongs to the empty set
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