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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/5 = 13/x // - 13/x
2/5-(13/x) = 0
2/5-13*x^-1 = 0
-13*x^-1 = -2/5 // : -13
x^-1 = 2/65
-1 < 0
1/(x^1) = 2/65 // * x^1
1 = 2/65*x^1 // : 2/65
65/2 = x^1
x = 65/2
x = 65/2
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