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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
52/39 = 39/x // - 39/x
52/39-(39/x) = 0
52/39-39*x^-1 = 0
-39*x^-1 = -4/3 // : -39
x^-1 = 4/117
-1 < 0
1/(x^1) = 4/117 // * x^1
1 = 4/117*x^1 // : 4/117
117/4 = x^1
x = 117/4
x = 117/4
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