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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
13 = 5/x // - 5/x
13-(5/x) = 0
13-5*x^-1 = 0
-5*x^-1 = -13 // : -5
x^-1 = 13/5
-1 < 0
1/(x^1) = 13/5 // * x^1
1 = 13/5*x^1 // : 13/5
5/13 = x^1
x = 5/13
x = 5/13
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