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D( x )
(x+5)*(x-5) = 0
(x+5)*(x-5) = 0
(x+5)*(x-5) = 0
( x+5 )
x+5 = 0 // - 5
x = -5
( x-5 )
x-5 = 0 // + 5
x = 5
x in (-oo:-5) U (-5:5) U (5:+oo)
(x^2*(x+8)*(x-9))/((x+5)*(x-5)) = 0
( x+8 )
x+8 = 0 // - 8
x = -8
( x-9 )
x-9 = 0 // + 9
x = 9
( x^2 )
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { -8, 9, 0 }
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