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p in (-oo:+oo)
(2/5)/4 = p/25 // - p/25
(2/5)/4-(p/25) = 0
1/10-1/25*p = 0 // - 1/10
-1/25*p = -1/10 // : -1/25
p = -1/10/(-1/25)
p = 5/2
p = 5/2
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