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p in (-oo:+oo)
2/400 = p/100 // - p/100
2/400-(p/100) = 0
1/200-1/100*p = 0 // - 1/200
-1/100*p = -1/200 // : -1/100
p = -1/200/(-1/100)
p = 1/2
p = 1/2
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