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k in (-oo:+oo)
(k^1)/3 = 8 // - 8
(k^1)/3-8 = 0
k/3-8 = 0
1/3*k-8 = 0 // + 8
1/3*k = 8 // : 1/3
k = 8/1/3
k = 24
k = 24
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