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k in (-oo:+oo)
2*(k-4) = 16 // - 16
2*(k-4)-16 = 0
2*(k-4)-16 = 0
2*k-24 = 0
2*k-24 = 0
2*k-24 = 0 // + 24
2*k = 24 // : 2
k = 24/2
k = 12
k = 12
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