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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
26/9 = 8/x // - 8/x
26/9-(8/x) = 0
26/9-8*x^-1 = 0
-8*x^-1 = -26/9 // : -8
x^-1 = 13/36
-1 < 0
1/(x^1) = 13/36 // * x^1
1 = 13/36*x^1 // : 13/36
36/13 = x^1
x = 36/13
x = 36/13
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