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k in (-oo:+oo)
2*(4-4*k) = -80 // + 80
2*(4-4*k)+80 = 0
2*(4-4*k)+80 = 0
88-8*k = 0
88-8*k = 0
88-8*k = 0 // - 88
-8*k = -88 // : -8
k = -88/(-8)
k = 11
k = 11
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