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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
15/p+2.999/6.725 = 0
15*p^-1 = -0.44594796 // : 15
p^-1 = -0.02972986
-1 < 0
1/(p^1) = -0.02972986 // * p^1
1 = -0.02972986*p^1 // : -0.02972986
-33.63621625 = p^1
p = -33.63621625
p = -33.63621625
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