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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/6 = 2/x-9 // - 2/x-9
5/6-(2/x)+9 = 0
5/6-2*x^-1+9 = 0
-2*x^-1 = -59/6 // : -2
x^-1 = 59/12
-1 < 0
1/(x^1) = 59/12 // * x^1
1 = 59/12*x^1 // : 59/12
12/59 = x^1
x = 12/59
x = 12/59
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