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k in (-oo:+oo)
9-(2*k) = 6*k+49 // - 6*k+49
9-(2*k)-(6*k)-49 = 0
9-2*k-6*k-49 = 0
-8*k-40 = 0 // + 40
-8*k = 40 // : -8
k = 40/(-8)
k = -5
k = -5
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