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k in (-oo:+oo)
(1/2)*k+5 = k+3 // - k+3
(1/2)*k-k-3+5 = 0
2-1/2*k = 0 // - 2
-1/2*k = -2 // : -1/2
k = -2/(-1/2)
k = 4
k = 4
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