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K in (-oo:+oo)
(K+8)/2 = 12 // - 12
(K+8)/2-12 = 0
(K+8)/2+(-12*2)/2 = 0
K-12*2+8 = 0
K-16 = 0
(K-16)/2 = 0
(K-16)/2 = 0 // * 2
K-16 = 0
K-16 = 0 // + 16
K = 16
K = 16
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