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K in (-oo:+oo)
K/2-6 < -16 // + 16
K/2-6+16 < 0
1/2*K+10 < 0 // - 10
1/2*K < -10 // : 1/2
K < -10/1/2
K < -20
K in (-oo:-20)
(-oo:-20)
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