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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
-6/p-(4/3) = 7/p // - 7/p
-6/p-(7/p)-(4/3) = 0
-6/p-7*p^-1-4/3 = 0
-13*p^-1 = 4/3 // : -13
p^-1 = -4/39
-1 < 0
1/(p^1) = -4/39 // * p^1
1 = -4/39*p^1 // : -4/39
-39/4 = p^1
p = -39/4
p = -39/4
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