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k in (-oo:+oo)
(1/2)*k-1/5 = 13/60 // - 13/60
(1/2)*k-1/5-(13/60) = 0
(1/2)*k-1/5-13/60 = 0
1/2*k-5/12 = 0 // + 5/12
1/2*k = 5/12 // : 1/2
k = 5/12/1/2
k = 5/6
k = 5/6
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