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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x = 8/13 // - 8/13
3/x-(8/13) = 0
3/x-8/13 = 0
3*x^-1 = 8/13 // : 3
x^-1 = 8/39
-1 < 0
1/(x^1) = 8/39 // * x^1
1 = 8/39*x^1 // : 8/39
39/8 = x^1
x = 39/8
x = 39/8
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