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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
15/30 = 5/p // - 5/p
15/30-(5/p) = 0
15/30-5*p^-1 = 0
-5*p^-1 = -1/2 // : -5
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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