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k in (-oo:+oo)
3*k-1 = 1/2-(2*k)-1 // - 1/2-(2*k)-1
3*k+2*k-(1/2)-1+1 = 0
3*k+2*k-1/2-1+1 = 0
5*k-1/2 = 0 // + 1/2
5*k = 1/2 // : 5
k = 1/2/5
k = 1/10
k = 1/10
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