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p in (-oo:+oo)
40/32 = p/100 // - p/100
40/32-(p/100) = 0
5/4-1/100*p = 0 // - 5/4
-1/100*p = -5/4 // : -1/100
p = -5/4/(-1/100)
p = 125
p = 125
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