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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(13*x)/x-(26/x)-2-2 = 0
(13*x)/x-26*x^-1-2-2 = 0
-26*x^-1 = -9 // : -26
x^-1 = 9/26
-1 < 0
1/(x^1) = 9/26 // * x^1
1 = 9/26*x^1 // : 9/26
26/9 = x^1
x = 26/9
x = 26/9
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