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K in (-oo:+oo)
K/8 = 3/8 // - 3/8
K/8-(3/8) = 0
K/8-3/8 = 0
1/8*K-3/8 = 0 // + 3/8
1/8*K = 3/8 // : 1/8
K = 3/8/1/8
K = 3
K = 3
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