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p in (-oo:+oo)
5/6 = p/15 // - p/15
5/6-(p/15) = 0
5/6-1/15*p = 0 // - 5/6
-1/15*p = -5/6 // : -1/15
p = -5/6/(-1/15)
p = 25/2
p = 25/2
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