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