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k in (-oo:+oo)
-8 = (4/6)*k // - (4/6)*k
-((4/6)*k)-8 = 0
(-2/3)*k-8 = 0
-2/3*k-8 = 0 // + 8
-2/3*k = 8 // : -2/3
k = 8/(-2/3)
k = -12
k = -12
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