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