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K in (-oo:+oo)
K^3 = 1/216 // - 1/216
K^3-(1/216) = 0
K^3-1/216 = 0
1*K^3 = 1/216 // : 1
K^3 = 1/216
K^3 = 1/216 // ^ 1/3
K = 1/6
K = 1/6
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