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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(10*x)/(x^2) = 9 // - 9
(10*x)/(x^2)-9 = 0
10*x^-1 = 9 // : 10
x^-1 = 9/10
-1 < 0
1/(x^1) = 9/10 // * x^1
1 = 9/10*x^1 // : 9/10
10/9 = x^1
x = 10/9
x = 10/9
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