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p in (-oo:+oo)
2.5/5 = p/8 // - p/8
2.5/5-(p/8) = 0
0.5-1/8*p = 0 // - 0.5
-1/8*p = -0.5 // : -1/8
p = -0.5/(-1/8)
p = 4
p = 4
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