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k in (-oo:+oo)
6*(-(4*k)-8) = -120 // + 120
6*(-(4*k)-8)+120 = 0
6*(-4*k-8)+120 = 0
6*(-4*k-8)+120 = 0
72-24*k = 0
72-24*k = 0
72-24*k = 0 // - 72
-24*k = -72 // : -24
k = -72/(-24)
k = 3
k = 3
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