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k in (-oo:+oo)
(6/5)*k-(2*k)+(2/5)*k+9/5+3/5-6 = 0
(6/5)*k-2*k+(2/5)*k+9/5+3/5-6 = 0
-2/5*k-18/5 = 0 // + 18/5
-2/5*k = 18/5 // : -2/5
k = 18/5/(-2/5)
k = -9
k = -9
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