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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(13/x+3)^2 = 0
(13*x^-1+3)^2 = 0
13*x^-1 = -3 // : 13
x^-1 = -3/13
-1 < 0
1/(x^1) = -3/13 // * x^1
1 = -3/13*x^1 // : -3/13
-13/3 = x^1
x = -13/3
x in { -13/3, -13/3 }
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