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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/8 = 9/x-2 // - 9/x-2
6/8-(9/x)+2 = 0
6/8-9*x^-1+2 = 0
-9*x^-1 = -11/4 // : -9
x^-1 = 11/36
-1 < 0
1/(x^1) = 11/36 // * x^1
1 = 11/36*x^1 // : 11/36
36/11 = x^1
x = 36/11
x = 36/11
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