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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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