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