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