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D( x )
5-(9*x) = 0
5-(9*x) = 0
5-(9*x) = 0
5-9*x = 0
5-9*x = 0 // - 5
-9*x = -5 // : -9
x = -5/(-9)
x = 5/9
x in (-oo:5/9) U (5/9:+oo)
(9*x-5)/(5-(9*x)) = 0
(9*x-5)/(5-9*x) = 0
9*x-5 = 0 // + 5
9*x = 5 // : 9
x = 5/9
x in { 5/9}
x belongs to the empty set
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