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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(1/3)*(9*x^-4*y^5*z)^2 = 0
27*x^-8*y^10*z^2 = 0 // : 27*y^10*z^2
x^-8 = 0
x należy do O
x belongs to the empty set
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