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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/5 = 13/x // - 13/x
3/5-(13/x) = 0
3/5-13*x^-1 = 0
-13*x^-1 = -3/5 // : -13
x^-1 = 3/65
-1 < 0
1/(x^1) = 3/65 // * x^1
1 = 3/65*x^1 // : 3/65
65/3 = x^1
x = 65/3
x = 65/3
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