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k in (-oo:+oo)
13/2 = k+(1/2)*k+5 // - k+(1/2)*k+5
13/2-k-((1/2)*k)-5 = 0
(-1/2)*k-k+13/2-5 = 0
3/2-3/2*k = 0 // - 3/2
-3/2*k = -3/2 // : -3/2
k = -3/2/(-3/2)
k = 1
k = 1
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