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