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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
9/p = 180/200 // - 180/200
9/p-(180/200) = 0
9/p-9/10 = 0
9*p^-1 = 9/10 // : 9
p^-1 = 1/10
-1 < 0
1/(p^1) = 1/10 // * p^1
1 = 1/10*p^1 // : 1/10
10 = p^1
p = 10
p = 10
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