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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/11 = 5/x // - 5/x
9/11-(5/x) = 0
9/11-5*x^-1 = 0
-5*x^-1 = -9/11 // : -5
x^-1 = 9/55
-1 < 0
1/(x^1) = 9/55 // * x^1
1 = 9/55*x^1 // : 9/55
55/9 = x^1
x = 55/9
x = 55/9
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