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k in (-oo:+oo)
4*(-(6*k)-6) = -144 // + 144
4*(-(6*k)-6)+144 = 0
4*(-6*k-6)+144 = 0
4*(-6*k-6)+144 = 0
120-24*k = 0
120-24*k = 0
120-24*k = 0 // - 120
-24*k = -120 // : -24
k = -120/(-24)
k = 5
k = 5
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