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k in (-oo:+oo)
(3/8)*k-(1/5) = 1/2 // - 1/2
(3/8)*k-(1/5)-(1/2) = 0
(3/8)*k-1/5-1/2 = 0
3/8*k-7/10 = 0 // + 7/10
3/8*k = 7/10 // : 3/8
k = 7/10/3/8
k = 28/15
k = 28/15
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