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k in (-oo:+oo)
-2 = k/4-1 // - k/4-1
1-(k/4)-2 = 0
-1/4*k-1 = 0 // + 1
-1/4*k = 1 // : -1/4
k = 1/(-1/4)
k = -4
k = -4
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