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k in (-oo:+oo)
(8/9)*k-(1/3)+1/2 = 0
(8/9)*k-1/3+1/2 = 0
8/9*k+1/6 = 0 // - 1/6
8/9*k = -1/6 // : 8/9
k = -1/6/8/9
k = -3/16
k = -3/16
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