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k in (-oo:+oo)
4*(2*k-8) = -24 // + 24
4*(2*k-8)+24 = 0
4*(2*k-8)+24 = 0
8*k-8 = 0
8*k-8 = 0
8*k-8 = 0 // + 8
8*k = 8 // : 8
k = 8/8
k = 1
k = 1
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