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k in (-oo:+oo)
(1/2)*k-5/9 = 17/18 // - 17/18
(1/2)*k-5/9-(17/18) = 0
(1/2)*k-5/9-17/18 = 0
1/2*k-3/2 = 0 // + 3/2
1/2*k = 3/2 // : 1/2
k = 3/2/1/2
k = 3
k = 3
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