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p in (-oo:+oo)
81/90 = p/20 // - p/20
81/90-(p/20) = 0
9/10-1/20*p = 0 // - 9/10
-1/20*p = -9/10 // : -1/20
p = -9/10/(-1/20)
p = 18
p = 18
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