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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x-9 = 5/6 // - 5/6
3/x-(5/6)-9 = 0
3/x-5/6-9 = 0
3*x^-1 = 59/6 // : 3
x^-1 = 59/18
-1 < 0
1/(x^1) = 59/18 // * x^1
1 = 59/18*x^1 // : 59/18
18/59 = x^1
x = 18/59
x = 18/59
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