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k in (-oo:+oo)
-((1/6)*k)-2 = -4 // + 4
4-((1/6)*k)-2 = 0
(-1/6)*k-2+4 = 0
2-1/6*k = 0 // - 2
-1/6*k = -2 // : -1/6
k = -2/(-1/6)
k = 12
k = 12
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