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k in (-oo:+oo)
2-2*k = 11/4 // - 11/4
2-2*k-(11/4) = 0
2-2*k-11/4 = 0
-2*k-3/4 = 0 // + 3/4
-2*k = 3/4 // : -2
k = 3/4/(-2)
k = -3/8
k = -3/8
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