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k in (-oo:+oo)
2*k-(3/2) = 4 // - 4
2*k-(3/2)-4 = 0
2*k-3/2-4 = 0
2*k-11/2 = 0 // + 11/2
2*k = 11/2 // : 2
k = 11/2/2
k = 11/4
k = 11/4
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