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K in (-oo:+oo)
K/4 = 77/2 // - 77/2
K/4-(77/2) = 0
K/4-77/2 = 0
1/4*K-77/2 = 0 // + 77/2
1/4*K = 77/2 // : 1/4
K = 77/2/1/4
K = 154
K = 154
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