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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+2/4-9/4 = 0
-1/2*k-7/4 = 0 // + 7/4
-1/2*k = 7/4 // : -1/2
k = 7/4/(-1/2)
k = -7/2
k = -7/2
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