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D( x )
x+8 = 0
x+8 = 0
x+8 = 0
x+8 = 0 // - 8
x = -8
x in (-oo:-8) U (-8:+oo)
(3*x-3)/(x+8) = 0
3*x-3 = 0 // + 3
3*x = 3 // : 3
x = 3/3
x = 1
x = 1
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