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k in (-oo:+oo)
6*k-(1/3) = (4/5)*k+53/75 // - (4/5)*k+53/75
6*k-((4/5)*k)-(1/3)-(53/75) = 0
6*k+(-4/5)*k-1/3-53/75 = 0
26/5*k-26/25 = 0 // + 26/25
26/5*k = 26/25 // : 26/5
k = 26/25/26/5
k = 1/5
k = 1/5
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