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K in (-oo:+oo)
K/3-(1/2) = 12 // - 12
K/3-(1/2)-12 = 0
K/3-1/2-12 = 0
1/3*K-25/2 = 0 // + 25/2
1/3*K = 25/2 // : 1/3
K = 25/2/1/3
K = 75/2
K = 75/2
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