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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
11/x = 5/45 // - 5/45
11/x-(5/45) = 0
11/x-1/9 = 0
11*x^-1 = 1/9 // : 11
x^-1 = 1/99
-1 < 0
1/(x^1) = 1/99 // * x^1
1 = 1/99*x^1 // : 1/99
99 = x^1
x = 99
x = 99
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