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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^2*((3*x^-4*y^4)/12)*y^-6 = 0
1/4*x^-2*y^-2 = 0 // : 1/4*y^-2
x^-2 = 0
x należy do O
x belongs to the empty set
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