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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
4/5 = 8/p-12 // - 8/p-12
4/5-(8/p)+12 = 0
4/5-8*p^-1+12 = 0
-8*p^-1 = -64/5 // : -8
p^-1 = 8/5
-1 < 0
1/(p^1) = 8/5 // * p^1
1 = 8/5*p^1 // : 8/5
5/8 = p^1
p = 5/8
p = 5/8
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