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k in (-oo:+oo)
0.5 = (k^2)/3 // - (k^2)/3
0.5-((k^2)/3) = 0
-1/3*k^2 = -0.5 // : -1/3
k^2 = 1.50000002
k^2 = 1.50000002 // ^ 1/2
abs(k) = 1.50000002^(1/2)
k = 1.50000002^(1/2) or k = -1.50000002^(1/2)
k in { 1.50000002^(1/2), -1.50000002^(1/2) }
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