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p in (-oo:+oo)
5/20 = p/15 // - p/15
5/20-(p/15) = 0
1/4-1/15*p = 0 // - 1/4
-1/15*p = -1/4 // : -1/15
p = -1/4/(-1/15)
p = 15/4
p = 15/4
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