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