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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/10 = 99/x // - 99/x
9/10-(99/x) = 0
9/10-99*x^-1 = 0
-99*x^-1 = -9/10 // : -99
x^-1 = 1/110
-1 < 0
1/(x^1) = 1/110 // * x^1
1 = 1/110*x^1 // : 1/110
110 = x^1
x = 110
x = 110
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