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k in (-oo:+oo)
(3*k)/5 = k+6 // - k+6
(3*k)/5-k-6 = 0
-2/5*k-6 = 0 // + 6
-2/5*k = 6 // : -2/5
k = 6/(-2/5)
k = -15
k = -15
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