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k in (-oo:+oo)
8-(4*k)-(6*k) = 18 // - 18
8-(4*k)-(6*k)-18 = 0
8-4*k-6*k-18 = 0
-10*k-10 = 0 // + 10
-10*k = 10 // : -10
k = 10/(-10)
k = -1
k = -1
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