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k in (-oo:+oo)
3.6 = k/5.5 // - k/5.5
3.6-(k/5.5) = 0
3.6-0.18181818*k = 0
3.6-0.18181818*k = 0 // - 3.6
-0.18181818*k = -3.6 // : -0.18181818
k = -3.6/(-0.18181818)
k = 19.8000002
k = 19.8000002
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