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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
((9*p^2*((3*(p-1))/p))/7)*(p-1) = 0
(3*9*p^2*(p-1)^2)/(7*p) = 0
( 9*p^2 )
9*p^2 = 0 // : 9
p^2 = 0
p = 0
( p-1 )
p-1 = 0 // + 1
p = 1
p in { 0}
p in { 1, 1 }
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