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p in (-oo:+oo)
66/120 = p/100 // - p/100
66/120-(p/100) = 0
11/20-1/100*p = 0 // - 11/20
-1/100*p = -11/20 // : -1/100
p = -11/20/(-1/100)
p = 55
p = 55
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