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P in (-oo:+oo)
P/2-5 < -9 // + 9
P/2-5+9 < 0
1/2*P+4 < 0 // - 4
1/2*P < -4 // : 1/2
P < -4/1/2
P < -8
P in (-oo:-8)
(-oo:-8)
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