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