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D( x )
x^6*y^3*z^2 = 0
x^6*y^3*z^2 = 0
x^6*y^3*z^2 = 0
x^6*y^3*z^2 = 0 // : y^3*z^2
x^6 = 0
x = 0
x in (-oo:0) U (0:+oo)
x^4*y^-1*((-2*a^0*(x^6*y^3*z^2)^-1)/6)*z^3 = 0
x^4*y^-1*((-2*(x^6*y^3*z^2)^-1)/6)*z^3 = 0
-1/3*x^-2*y^-4*z = 0 // : -1/3*y^-4*z
x^-2 = 0
x naleu017Cy do O
x belongs to the empty set
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