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k in (-oo:+oo)
-(6*k)-1 = 19-2*k // - 19-2*k
-(6*k)-(-2*k)-19-1 = 0
2*k-6*k-19-1 = 0
-4*k-20 = 0 // + 20
-4*k = 20 // : -4
k = 20/(-4)
k = -5
k = -5
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