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k in (-oo:+oo)
(1/2)*k-k+8 = 61/8 // - 61/8
(1/2)*k-k-(61/8)+8 = 0
(1/2)*k-k-61/8+8 = 0
3/8-1/2*k = 0 // - 3/8
-1/2*k = -3/8 // : -1/2
k = -3/8/(-1/2)
k = 3/4
k = 3/4
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