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p in (-oo:+oo)
81/100-p^2 = 0
-1*p^2 = -81/100 // : -1
p^2 = 81/100
p^2 = 81/100 // ^ 1/2
abs(p) = 9/10
p = 9/10 or p = -9/10
p in { 9/10, -9/10 }
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