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k in (-oo:+oo)
3-((1/2)*(k+1)) = 6 // - 6
3-((1/2)*(k+1))-6 = 0
(-1/2)*(k+1)-6+3 = 0
3-1/2*(k+1)-6 = 0
3-1/2*(k+1)-6 = 0
3-1/2*k-13/2 = 0
-1/2*k-7/2 = 0
-1/2*k-7/2 = 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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