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k in (-oo:+oo)
(3/4)*k-2 = k // - k
(3/4)*k-k-2 = 0
-1/4*k-2 = 0 // + 2
-1/4*k = 2 // : -1/4
k = 2/(-1/4)
k = -8
k = -8
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