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p in (-oo:+oo)
45/60 = p/100 // - p/100
45/60-(p/100) = 0
3/4-1/100*p = 0 // - 3/4
-1/100*p = -3/4 // : -1/100
p = -3/4/(-1/100)
p = 75
p = 75
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