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p in (-oo:+oo)
12 > p/2 // - p/2
12-(p/2) > 0
12-1/2*p > 0 // - 12
-1/2*p > -12 // : -1/2
p < -12/(-1/2)
p < 24
p in (-oo:24)
(-oo:24)
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