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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1-(9.9/x) = 0
1-9.9*x^-1 = 0
-9.9*x^-1 = -1 // : -9.9
x^-1 = 0.1010101
-1 < 0
1/(x^1) = 0.1010101 // * x^1
1 = 0.1010101*x^1 // : 0.1010101
9.9000001 = x^1
x = 9.9000001
x = 9.9000001
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