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