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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
6 = -(5/p)-10 // + -(5/p)-10
5/p+6+10 = 0
5*p^-1 = -16 // : 5
p^-1 = -16/5
-1 < 0
1/(p^1) = -16/5 // * p^1
1 = -16/5*p^1 // : -16/5
-5/16 = p^1
p = -5/16
p = -5/16
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