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