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K in (-oo:+oo)
3*K+K/2 = 2 // - 2
3*K+K/2-2 = 0
7/2*K-2 = 0 // + 2
7/2*K = 2 // : 7/2
K = 2/7/2
K = 4/7
K = 4/7
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