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D( p )
3*p = 0
p = 0
3*p = 0
3*p = 0
3*p = 0 // : 3
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
1/p-(1/(3*p)) = 1/12 // - 1/12
1/p-(1/(3*p))-(1/12) = 0
1/p+(-1/3)*p^-1-1/12 = 0
2/3*p^-1 = 1/12 // : 2/3
p^-1 = 1/8
-1 < 0
1/(p^1) = 1/8 // * p^1
1 = 1/8*p^1 // : 1/8
8 = p^1
p = 8
p = 8
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