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P in (-oo:+oo)
P/11 < -6 // + 6
P/11+6 < 0
1/11*P+6 < 0 // - 6
1/11*P < -6 // : 1/11
P < -6/1/11
P < -66
P in (-oo:-66)
(-oo:-66)
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