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z in (-oo:+oo)
(z^1)/3 = 9 // - 9
(z^1)/3-9 = 0
z/3-9 = 0
1/3*z-9 = 0 // + 9
1/3*z = 9 // : 1/3
z = 9/1/3
z = 27
z = 27
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