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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((8*x^-3*y^3*z^6)^1)/3 = 0
(8*x^-3*y^3*z^6)/3 = 0
8/3*x^-3*y^3*z^6 = 0 // : 8/3*y^3*z^6
x^-3 = 0
x należy do O
x belongs to the empty set
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