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k in (-oo:+oo)
(2/9)*k-(2/6) = 1/5 // - 1/5
(2/9)*k-(2/6)-(1/5) = 0
(2/9)*k-1/3-1/5 = 0
2/9*k-8/15 = 0 // + 8/15
2/9*k = 8/15 // : 2/9
k = 8/15/2/9
k = 12/5
k = 12/5
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