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k in (-oo:+oo)
(2*k)/(-2.6) = 12 // - 12
(2*k)/(-2.6)-12 = 0
-0.76923077*k-12 = 0 // + 12
-0.76923077*k = 12 // : -0.76923077
k = 12/(-0.76923077)
k = -15.59999998
k = -15.59999998
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