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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
22.5/9 = 30/p // - 30/p
22.5/9-(30/p) = 0
22.5/9-30*p^-1 = 0
-30*p^-1 = -2.5 // : -30
p^-1 = 0.08333333
-1 < 0
1/(p^1) = 0.08333333 // * p^1
1 = 0.08333333*p^1 // : 0.08333333
12.00000048 = p^1
p = 12.00000048
p = 12.00000048
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