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K in (-oo:+oo)
K/4 = 12/2 // - 12/2
K/4-(12/2) = 0
K/4-6 = 0
1/4*K-6 = 0 // + 6
1/4*K = 6 // : 1/4
K = 6/1/4
K = 24
K = 24
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