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P in (-oo:+oo)
P/3 < -12 // + 12
P/3+12 < 0
1/3*P+12 < 0 // - 12
1/3*P < -12 // : 1/3
P < -12/1/3
P < -36
P in (-oo:-36)
(-oo:-36)
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