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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x = 26 // - 26
4/x-26 = 0
4*x^-1 = 26 // : 4
x^-1 = 13/2
-1 < 0
1/(x^1) = 13/2 // * x^1
1 = 13/2*x^1 // : 13/2
2/13 = x^1
x = 2/13
x = 2/13
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