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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/13 = 26/x // - 26/x
6/13-(26/x) = 0
6/13-26*x^-1 = 0
-26*x^-1 = -6/13 // : -26
x^-1 = 3/169
-1 < 0
1/(x^1) = 3/169 // * x^1
1 = 3/169*x^1 // : 3/169
169/3 = x^1
x = 169/3
x = 169/3
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