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k in (-oo:+oo)
-3/5 = (3*k-6)/8 // - (3*k-6)/8
-((3*k-6)/8)-3/5 = 0
(-1*(3*k-6))/8-3/5 = 0
(-1*5*(3*k-6))/(5*8)+(-3*8)/(5*8) = 0
-1*5*(3*k-6)-3*8 = 0
6-15*k = 0
(6-15*k)/(5*8) = 0
(6-15*k)/(5*8) = 0 // * 5*8
6-15*k = 0
6-15*k = 0 // - 6
-15*k = -6 // : -15
k = -6/(-15)
k = 2/5
k = 2/5
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