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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+2/x+2 = x-(5/9) // - x-(5/9)
x-x+2/x+5/9+2 = 0
2*x^-1 = -23/9 // : 2
x^-1 = -23/18
-1 < 0
1/(x^1) = -23/18 // * x^1
1 = -23/18*x^1 // : -23/18
-18/23 = x^1
x = -18/23
x = -18/23
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