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