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D( x )
(x+8)^2 = 0
(x+8)^2 = 0
(x+8)^2 = 0
x+8 = 0 // - 8
x = -8
x in (-oo:-8) U (-8:+oo)
1/((x+8)^2) = 0
x belongs to the empty set
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