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k in (-oo:+oo)
0.5 = k/8 // - k/8
0.5-(k/8) = 0
0.5-1/8*k = 0 // - 0.5
-1/8*k = -0.5 // : -1/8
k = -0.5/(-1/8)
k = 4
k = 4
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