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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x-(2/x)-2 = 1/5 // - 1/5
1/x-(2/x)-(1/5)-2 = 0
1/x-2*x^-1-1/5-2 = 0
-1*x^-1 = 11/5 // : -1
x^-1 = -11/5
-1 < 0
1/(x^1) = -11/5 // * x^1
1 = -11/5*x^1 // : -11/5
-5/11 = x^1
x = -5/11
x = -5/11
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