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k in (-oo:+oo)
(1/2)*k+2/3 = 14/3 // - 14/3
(1/2)*k+2/3-(14/3) = 0
(1/2)*k+2/3-14/3 = 0
1/2*k-4 = 0 // + 4
1/2*k = 4 // : 1/2
k = 4/1/2
k = 8
k = 8
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