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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4 = 13/x-2 // - 13/x-2
2-(13/x)+4 = 0
2-13*x^-1+4 = 0
-13*x^-1 = -6 // : -13
x^-1 = 6/13
-1 < 0
1/(x^1) = 6/13 // * x^1
1 = 6/13*x^1 // : 6/13
13/6 = x^1
x = 13/6
x = 13/6
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