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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/13 = 5/x // - 5/x
7/13-(5/x) = 0
7/13-5*x^-1 = 0
-5*x^-1 = -7/13 // : -5
x^-1 = 7/65
-1 < 0
1/(x^1) = 7/65 // * x^1
1 = 7/65*x^1 // : 7/65
65/7 = x^1
x = 65/7
x = 65/7
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