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k in (-oo:+oo)
(2/3)*k-3 = (1/3)*k-(53/18) // - (1/3)*k-(53/18)
(2/3)*k-((1/3)*k)+53/18-3 = 0
(2/3)*k+(-1/3)*k+53/18-3 = 0
1/3*k-1/18 = 0 // + 1/18
1/3*k = 1/18 // : 1/3
k = 1/18/1/3
k = 1/6
k = 1/6
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