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D( x )
3*x^9*y^6 = 0
3*x^9*y^6 = 0
3*x^9*y^6 = 0
3*x^9*y^6 = 0 // : 3*y^6
x^9 = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^6*z^3)/(3*x^9*y^6) = 0
1/3*x^-3*y^-6*z^3 = 0 // : 1/3*y^-6*z^3
x^-3 = 0
x należy do O
x belongs to the empty set
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