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k in (-oo:+oo)
-4*k-(4/(-4)) = -3 // + 3
3-4*k-(4/(-4)) = 0
1-4*k+3 = 0
4-4*k = 0 // - 4
-4*k = -4 // : -4
k = -4/(-4)
k = 1
k = 1
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