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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
9/10 = 10/p // - 10/p
9/10-(10/p) = 0
9/10-10*p^-1 = 0
-10*p^-1 = -9/10 // : -10
p^-1 = 9/100
-1 < 0
1/(p^1) = 9/100 // * p^1
1 = 9/100*p^1 // : 9/100
100/9 = p^1
p = 100/9
p = 100/9
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