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