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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
3/4 = 6/p // - 6/p
3/4-(6/p) = 0
3/4-6*p^-1 = 0
-6*p^-1 = -3/4 // : -6
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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