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p in (-oo:+oo)
8-(p/2) <= 1 // - 1
8-(p/2)-1 <= 0
7-1/2*p <= 0 // - 7
-1/2*p <= -7 // : -1/2
p >= -7/(-1/2)
p >= 14
p in <14:+oo)
<14:+oo)
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