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k in (-oo:+oo)
18/5-(2*k) = 6 // - 6
18/5-(2*k)-6 = 0
18/5-2*k-6 = 0
-2*k-12/5 = 0 // + 12/5
-2*k = 12/5 // : -2
k = 12/5/(-2)
k = -6/5
k = -6/5
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