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K in (-oo:+oo)
9*K = 1/8 // - 1/8
9*K-(1/8) = 0
9*K-1/8 = 0
9*K-1/8 = 0 // + 1/8
9*K = 1/8 // : 9
K = 1/8/9
K = 1/72
K = 1/72
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