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D( x )
25*x^34*z^28 = 0
25*x^34*z^28 = 0
25*x^34*z^28 = 0
25*x^34*z^28 = 0 // : 25*z^28
x^34 = 0
x = 0
x in (-oo:0) U (0:+oo)
(y^18)/(25*x^34*z^28) = 0
1/25*x^-34*y^18*z^-28 = 0 // : 1/25*y^18*z^-28
x^-34 = 0
x naleu017Cy do O
x belongs to the empty set
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