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k in (-oo:+oo)
(5*k)/6+2/3 = 4/3 // - 4/3
(5*k)/6+2/3-(4/3) = 0
(5*k)/6+2/3-4/3 = 0
5/6*k-2/3 = 0 // + 2/3
5/6*k = 2/3 // : 5/6
k = 2/3/5/6
k = 4/5
k = 4/5
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