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K in (-oo:+oo)
K/6 = 4/4 // - 4/4
K/6-(4/4) = 0
K/6-1 = 0
1/6*K-1 = 0 // + 1
1/6*K = 1 // : 1/6
K = 1/1/6
K = 6
K = 6
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