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