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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
(10*p)/p-7 = 8/9 // - 8/9
(10*p)/p-(8/9)-7 = 0
(10*p)/p-8/9-7 = 0
19/9 = 0
p belongs to the empty set
p belongs to the empty set
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