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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^3*((14*x^-5*y^-3)/8)*y^-6 = 0
7/4*x^-2*y^-9 = 0 // : 7/4*y^-9
x^-2 = 0
x należy do O
x belongs to the empty set
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