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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
90/p = 10 // - 10
90/p-10 = 0
90*p^-1 = 10 // : 90
p^-1 = 1/9
-1 < 0
1/(p^1) = 1/9 // * p^1
1 = 1/9*p^1 // : 1/9
9 = p^1
p = 9
p = 9
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