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