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D( x )
(3/4)*x^-1*y = 0
x = 0
(3/4)*x^-1*y = 0
(3/4)*x^-1*y = 0
3/4*x^-1*y = 0 // : 3/4*y
x^-1 = 0
x należy do O
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((3/4)*x^-1*y)^-2 = 0
16/9*x^2*y^-2 = 0 // : 16/9*y^-2
x^2 = 0
x = 0
x in { 0}
x belongs to the empty set
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