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