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k in (-oo:+oo)
(2/3)*k = 28.4/9 // - 28.4/9
(2/3)*k-(28.4/9) = 0
(2/3)*k-3.15555556 = 0
2/3*k-3.15555556 = 0 // + 3.15555556
2/3*k = 3.15555556 // : 2/3
k = 3.15555556/2/3
k = 4.73333332
k = 4.73333332
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