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D( x )
(x^5*y^4*z^2)^5 = 0
x^3*y^-1*z^-5 = 0
(x^5*y^4*z^2)^5 = 0
(x^5*y^4*z^2)^5 = 0
x^25*y^20*z^10 = 0 // : y^20*z^10
x^25 = 0
x = 0
x^3*y^-1*z^-5 = 0
x^3*y^-1*z^-5 = 0
x^3*y^-1*z^-5 = 0 // : y^-1*z^-5
x^3 = 0
x = 0
x in (-oo:0) U (0:+oo)
((x^3*y^-1*z^-5)^-2)/((x^5*y^4*z^2)^5) = 0
x^-31*y^-18 = 0 // : y^-18
x^-31 = 0
x naleu017Cy do O
x belongs to the empty set
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