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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(108/x)/3 = 39 // - 39
(108/x)/3-39 = 0
36*x^-1 = 39 // : 36
x^-1 = 13/12
-1 < 0
1/(x^1) = 13/12 // * x^1
1 = 13/12*x^1 // : 13/12
12/13 = x^1
x = 12/13
x = 12/13
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