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z in (-oo:+oo)
(z^16)/23 = -4/23 // + -4/23
(z^16)/23-(-4/23) = 0
(z^16)/23+4/23 = 0
1/23*z^16 = -4/23 // : 1/23
z^16 = -4
z belongs to the empty set
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