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k in (-oo:+oo)
1/4 = k/0.8 // - k/0.8
1/4-(k/0.8) = 0
1/4-1.25*k = 0
1/4-1.25*k = 0 // - 1/4
-1.25*k = -1/4 // : -1.25
k = -1/4/(-1.25)
k = 0.2
k = 0.2
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