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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/x+1 = 18/54 // - 18/54
9/x-(18/54)+1 = 0
9/x-1/3+1 = 0
9*x^-1 = -2/3 // : 9
x^-1 = -2/27
-1 < 0
1/(x^1) = -2/27 // * x^1
1 = -2/27*x^1 // : -2/27
-27/2 = x^1
x = -27/2
x = -27/2
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