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k in (-oo:+oo)
6.8/17 = k/2 // - k/2
6.8/17-(k/2) = 0
0.4-1/2*k = 0 // - 0.4
-1/2*k = -0.4 // : -1/2
k = -0.4/(-1/2)
k = 0.8
k = 0.8
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