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k in (-oo:+oo)
(1/2)*k+k-(2/3) = 7/6 // - 7/6
(1/2)*k+k-(2/3)-(7/6) = 0
(1/2)*k+k-2/3-7/6 = 0
3/2*k-11/6 = 0 // + 11/6
3/2*k = 11/6 // : 3/2
k = 11/6/3/2
k = 11/9
k = 11/9
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