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k in (-oo:+oo)
k/(-8.5) = -4 // + 4
k/(-8.5)+4 = 0
4-0.11764706*k = 0 // - 4
-0.11764706*k = -4 // : -0.11764706
k = -4/(-0.11764706)
k = 33.99999966
k = 33.99999966
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