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k in (-oo:+oo)
6/10 = k/4.5 // - k/4.5
6/10-(k/4.5) = 0
6/10-0.22222222*k = 0
3/5-0.22222222*k = 0 // - 3/5
-0.22222222*k = -3/5 // : -0.22222222
k = -3/5/(-0.22222222)
k = 2.70000003
k = 2.70000003
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