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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/x-5 = 5-81/x // - 5-81/x
9/x-(-81/x)-5-5 = 0
9/x+81*x^-1-5-5 = 0
90*x^-1 = 10 // : 90
x^-1 = 1/9
-1 < 0
1/(x^1) = 1/9 // * x^1
1 = 1/9*x^1 // : 1/9
9 = x^1
x = 9
x = 9
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