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k in (-oo:+oo)
(-3*k)/18 = 48/18 // - 48/18
(-3*k)/18-(48/18) = 0
(-3*k)/18-8/3 = 0
-1/6*k-8/3 = 0 // + 8/3
-1/6*k = 8/3 // : -1/6
k = 8/3/(-1/6)
k = -16
k = -16
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