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z in (-oo:+oo)
z^3 = 8/9 // - 8/9
z^3-(8/9) = 0
z^3-8/9 = 0
1*z^3 = 8/9 // : 1
z^3 = 8/9
z^3 = 8/9 // ^ 1/3
z = (8/9)^(1/3)
z = (8/9)^(1/3)
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