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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(5/6)*(5/6) = 1/x // - 1/x
(5/6)*(5/6)-(1/x) = 0
(5/6)*(5/6)-x^-1 = 0
-1*x^-1 = -25/36 // : -1
x^-1 = 25/36
-1 < 0
1/(x^1) = 25/36 // * x^1
1 = 25/36*x^1 // : 25/36
36/25 = x^1
x = 36/25
x = 36/25
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