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