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k in (-oo:+oo)
2*k-(4*k)-1 = -3 // + 3
2*k-(4*k)-1+3 = 0
2*k-4*k-1+3 = 0
2-2*k = 0 // - 2
-2*k = -2 // : -2
k = -2/(-2)
k = 1
k = 1
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