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k in (-oo:+oo)
-k-(4*k)-1 = -26 // + 26
26-k-(4*k)-1 = 0
26-k-4*k-1 = 0
25-5*k = 0 // - 25
-5*k = -25 // : -5
k = -25/(-5)
k = 5
k = 5
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