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k in (-oo:+oo)
1-(6*k) = -2*k-3 // + -2*k-3
1-(6*k)-(-2*k)+3 = 0
2*k-6*k+1+3 = 0
4-4*k = 0 // - 4
-4*k = -4 // : -4
k = -4/(-4)
k = 1
k = 1
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