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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x = 16/13 // - 16/13
4/x-(16/13) = 0
4/x-16/13 = 0
4*x^-1 = 16/13 // : 4
x^-1 = 4/13
-1 < 0
1/(x^1) = 4/13 // * x^1
1 = 4/13*x^1 // : 4/13
13/4 = x^1
x = 13/4
x = 13/4
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