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D( p )
8*p-32 = 0
8*p-32 = 0
8*p-32 = 0
8*p-32 = 0 // + 32
8*p = 32 // : 8
p = 32/8
p = 4
p in (-oo:4) U (4:+oo)
(6*p-24)/(8*p-32) = 0
6*p-24 = 0 // + 24
6*p = 24 // : 6
p = 24/6
p = 4
p in { 4}
p belongs to the empty set
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