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D( p )
p = 0
9*p-9 = 0
p = 0
p = 0
9*p-9 = 0
9*p-9 = 0
9*p-9 = 0 // + 9
9*p = 9 // : 9
p = 9/9
p = 1
p in (-oo:0) U (0:1) U (1:+oo)
(8*p^2*((2*p-2)/p))/(9*p-9) = 0
(8*p^2*(2*p-2))/(p*(9*p-9)) = 0
( 2*p-2 )
2*p-2 = 0 // + 2
2*p = 2 // : 2
p = 2/2
p = 1
( 8*p^2 )
8*p^2 = 0 // : 8
p^2 = 0
p = 0
p in { 1}
p in { 0}
p belongs to the empty set
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