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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
1/4-5/8*k = 0 // - 1/4
-5/8*k = -1/4 // : -5/8
k = -1/4/(-5/8)
k = 2/5
k = 2/5
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