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k in (-oo:+oo)
k/(-4) = -0.8 // + 0.8
k/(-4)+0.8 = 0
0.8-1/4*k = 0 // - 0.8
-1/4*k = -0.8 // : -1/4
k = -0.8/(-1/4)
k = 3.2
k = 3.2
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