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D( x )
1-(9*x) = 0
x = 0
1-(9*x) = 0
1-(9*x) = 0
1-9*x = 0
1-9*x = 0 // - 1
-9*x = -1 // : -9
x = -1/(-9)
x = 1/9
x = 0
x = 0
x in (-oo:0) U (0:1/9) U (1/9:+oo)
(3/(1-(9*x)))/x = 0
(3/(1-9*x))/x = 0
3/(x*(1-9*x)) = 0
x belongs to the empty set
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