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