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D( x )
x^6*y^3 = 0
x^6*y^3 = 0
x^6*y^3 = 0
x^6*y^3 = 0 // : y^3
x^6 = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^6*y^2)/(x^6*y^3) = 0
y^-1 = 0
x należy do R
x in (-oo:0) U (0:+oo)
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