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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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