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k in (-oo:+oo)
8/9.2 = k/18.4 // - k/18.4
8/9.2-(k/18.4) = 0
8/9.2-0.05434783*k = 0
0.86956522-0.05434783*k = 0 // - 0.86956522
-0.05434783*k = -0.86956522 // : -0.05434783
k = -0.86956522/(-0.05434783)
k = 15.9999989
k = 15.9999989
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