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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)
(8*x)/(x+8)+4/(x+8) = 0
8*x+4 = 0
(8*x+4)/(x+8) = 0
(8*x+4)/(x+8) = 0 // * x+8
8*x+4 = 0
8*x+4 = 0 // - 4
8*x = -4 // : 8
x = -4/8
x = -1/2
x = -1/2
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