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k in (-oo:+oo)
k/2-k-(2/4) = 9/4 // - 9/4
k/2-k-(2/4)-(9/4) = 0
k/2-k-1/2-9/4 = 0
-1/2*k-11/4 = 0 // + 11/4
-1/2*k = 11/4 // : -1/2
k = 11/4/(-1/2)
k = -11/2
k = -11/2
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