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