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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/6 = 3/x-1 // - 3/x-1
5/6-(3/x)+1 = 0
5/6-3*x^-1+1 = 0
-3*x^-1 = -11/6 // : -3
x^-1 = 11/18
-1 < 0
1/(x^1) = 11/18 // * x^1
1 = 11/18*x^1 // : 11/18
18/11 = x^1
x = 18/11
x = 18/11
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