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