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p in (-oo:+oo)
8/10 = p/5 // - p/5
8/10-(p/5) = 0
4/5-1/5*p = 0 // - 4/5
-1/5*p = -4/5 // : -1/5
p = -4/5/(-1/5)
p = 4
p = 4
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