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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
49/p = 8-1 // - 8-1
49/p-8+1 = 0
49*p^-1 = 7 // : 49
p^-1 = 1/7
-1 < 0
1/(p^1) = 1/7 // * p^1
1 = 1/7*p^1 // : 1/7
7 = p^1
p = 7
p = 7
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