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