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k in (-oo:+oo)
(3/5)*k-((1/5)*k) = 4/15 // - 4/15
(3/5)*k-((1/5)*k)-(4/15) = 0
(3/5)*k+(-1/5)*k-4/15 = 0
2/5*k-4/15 = 0 // + 4/15
2/5*k = 4/15 // : 2/5
k = 4/15/2/5
k = 2/3
k = 2/3
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