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p in (-oo:+oo)
4 > p/8 // - p/8
4-(p/8) > 0
4-1/8*p > 0 // - 4
-1/8*p > -4 // : -1/8
p < -4/(-1/8)
p < 32
p in (-oo:32)
(-oo:32)
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