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k in (-oo:+oo)
3*k+5 = (4/5)*k+161/30 // - (4/5)*k+161/30
3*k-((4/5)*k)-(161/30)+5 = 0
3*k+(-4/5)*k-161/30+5 = 0
11/5*k-11/30 = 0 // + 11/30
11/5*k = 11/30 // : 11/5
k = 11/30/11/5
k = 1/6
k = 1/6
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