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