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p in (-oo:+oo)
120/66 = p/100 // - p/100
120/66-(p/100) = 0
20/11-1/100*p = 0 // - 20/11
-1/100*p = -20/11 // : -1/100
p = -20/11/(-1/100)
p = 2000/11
p = 2000/11
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