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K in (-oo:+oo)
3*K-4 = K/2+3.5 // - K/2+3.5
3*K-(K/2)-4-3.5 = 0
5/2*K-7.5 = 0 // + 7.5
5/2*K = 7.5 // : 5/2
K = 7.5/5/2
K = 3
K = 3
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