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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
12 = 0.648/p // - 0.648/p
12-(0.648/p) = 0
12-0.648*p^-1 = 0
-0.648*p^-1 = -12 // : -0.648
p^-1 = 18.51851852
-1 < 0
1/(p^1) = 18.51851852 // * p^1
1 = 18.51851852*p^1 // : 18.51851852
0.054 = p^1
p = 0.054
p = 0.054
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