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p in (-oo:+oo)
-16/80 = p/100 // - p/100
-(p/100)-16/80 = 0
-1/100*p-1/5 = 0 // + 1/5
-1/100*p = 1/5 // : -1/100
p = 1/5/(-1/100)
p = -20
p = -20
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