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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-11/2 = 0
-1/2*k-5/2 = 0
-1/2*k-5/2 = 0
-1/2*k-5/2 = 0 // + 5/2
-1/2*k = 5/2 // : -1/2
k = 5/2/(-1/2)
k = -5
k = -5
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