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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
3/p-7 = -2 // + 2
3/p-7+2 = 0
3*p^-1 = 5 // : 3
p^-1 = 5/3
-1 < 0
1/(p^1) = 5/3 // * p^1
1 = 5/3*p^1 // : 5/3
3/5 = p^1
p = 3/5
p = 3/5
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