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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x = 13 // - 13
8/x-13 = 0
8*x^-1 = 13 // : 8
x^-1 = 13/8
-1 < 0
1/(x^1) = 13/8 // * x^1
1 = 13/8*x^1 // : 13/8
8/13 = x^1
x = 8/13
x = 8/13
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