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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x+1/x-2-1 = 5/6 // - 5/6
1/x+1/x-(5/6)-2-1 = 0
1/x+1/x-5/6-2-1 = 0
2*x^-1 = 23/6 // : 2
x^-1 = 23/12
-1 < 0
1/(x^1) = 23/12 // * x^1
1 = 23/12*x^1 // : 23/12
12/23 = x^1
x = 12/23
x = 12/23
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