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p in (-oo:+oo)
15/18 > p/12 // - p/12
15/18-(p/12) > 0
5/6-1/12*p > 0 // - 5/6
-1/12*p > -5/6 // : -1/12
p < -5/6/(-1/12)
p < 10
p in (-oo:10)
(-oo:10)
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