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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
2/p = 18 // - 18
2/p-18 = 0
2*p^-1 = 18 // : 2
p^-1 = 9
-1 < 0
1/(p^1) = 9 // * p^1
1 = 9*p^1 // : 9
1/9 = p^1
p = 1/9
p = 1/9
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