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