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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
13/x = 2/3 // - 2/3
13/x-(2/3) = 0
13/x-2/3 = 0
13*x^-1 = 2/3 // : 13
x^-1 = 2/39
-1 < 0
1/(x^1) = 2/39 // * x^1
1 = 2/39*x^1 // : 2/39
39/2 = x^1
x = 39/2
x = 39/2
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