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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
13/5 = 2/x // - 2/x
13/5-(2/x) = 0
13/5-2*x^-1 = 0
-2*x^-1 = -13/5 // : -2
x^-1 = 13/10
-1 < 0
1/(x^1) = 13/10 // * x^1
1 = 13/10*x^1 // : 13/10
10/13 = x^1
x = 10/13
x = 10/13
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