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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
-3/p = 12 // - 12
-3/p-12 = 0
-3*p^-1 = 12 // : -3
p^-1 = -4
-1 < 0
1/(p^1) = -4 // * p^1
1 = -4*p^1 // : -4
-1/4 = p^1
p = -1/4
p = -1/4
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