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