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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x+3+3 = 13/x+3 // - 13/x+3
1/x-(13/x)-3+3+3 = 0
1/x-13*x^-1-3+3+3 = 0
-12*x^-1 = -3 // : -12
x^-1 = 1/4
-1 < 0
1/(x^1) = 1/4 // * x^1
1 = 1/4*x^1 // : 1/4
4 = x^1
x = 4
x = 4
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