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k in (-oo:+oo)
k^3 = 8/27 // - 8/27
k^3-(8/27) = 0
k^3-8/27 = 0
1*k^3 = 8/27 // : 1
k^3 = 8/27
k^3 = 8/27 // ^ 1/3
k = 2/3
k = 2/3
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