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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^-2*((20*x^4*y^-3)/17)*y*((34*x^-3*y)/30)*y^-2 = 0
4/3*x^-1*y^-3 = 0 // : 4/3*y^-3
x^-1 = 0
x należy do O
x belongs to the empty set
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