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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/3 = 10/x-9 // - 10/x-9
6/3-(10/x)+9 = 0
6/3-10*x^-1+9 = 0
-10*x^-1 = -11 // : -10
x^-1 = 11/10
-1 < 0
1/(x^1) = 11/10 // * x^1
1 = 11/10*x^1 // : 11/10
10/11 = x^1
x = 10/11
x = 10/11
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