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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x = 3/13 // - 3/13
4/x-(3/13) = 0
4/x-3/13 = 0
4*x^-1 = 3/13 // : 4
x^-1 = 3/52
-1 < 0
1/(x^1) = 3/52 // * x^1
1 = 3/52*x^1 // : 3/52
52/3 = x^1
x = 52/3
x = 52/3
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