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k in (-oo:+oo)
9.1-(k/1.2) = -2.9 // + 2.9
2.9-(k/1.2)+9.1 = 0
2.9-0.83333333*k+9.1 = 0
12-0.83333333*k = 0 // - 12
-0.83333333*k = -12 // : -0.83333333
k = -12/(-0.83333333)
k = 14.40000006
k = 14.40000006
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