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k in (-oo:+oo)
2*(-4*k-2) = 76 // - 76
2*(-4*k-2)-76 = 0
2*(-4*k-2)-76 = 0
-8*k-80 = 0
-8*k-80 = 0
-8*k-80 = 0 // + 80
-8*k = 80 // : -8
k = 80/(-8)
k = -10
k = -10
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