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