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D( x )
8*x^5*y^2*z^9 = 0
8*x^5*y^2*z^9 = 0
8*x^5*y^2*z^9 = 0
8*x^5*y^2*z^9 = 0 // : 8*y^2*z^9
x^5 = 0
x = 0
x in (-oo:0) U (0:+oo)
(4*x^3*y^7*z^9)/(8*x^5*y^2*z^9) = 0
1/2*x^-2*y^5 = 0 // : 1/2*y^5
x^-2 = 0
x należy do O
x belongs to the empty set
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