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