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k in (-oo:+oo)
(-1/4)*k+5/6 = 4/3 // - 4/3
(-1/4)*k+5/6-(4/3) = 0
(-1/4)*k+5/6-4/3 = 0
-1/4*k-1/2 = 0 // + 1/2
-1/4*k = 1/2 // : -1/4
k = 1/2/(-1/4)
k = -2
k = -2
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