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K in (-oo:+oo)
(K^3)/2-6 = 337 // - 337
(K^3)/2-337-6 = 0
1/2*K^3 = 343 // : 1/2
K^3 = 686
K^3 = 686 // ^ 1/3
K = 7*2^(1/3)
K = 7*2^(1/3)
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