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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
12/x-9 = 5/9 // - 5/9
12/x-(5/9)-9 = 0
12/x-5/9-9 = 0
12*x^-1 = 86/9 // : 12
x^-1 = 43/54
-1 < 0
1/(x^1) = 43/54 // * x^1
1 = 43/54*x^1 // : 43/54
54/43 = x^1
x = 54/43
x = 54/43
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