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D( x )
9/1-(2*x) = 0
9/1-(2*x) = 0
9/1-(2*x) = 0
9-2*x = 0
9-2*x = 0 // - 9
-2*x = -9 // : -2
x = -9/(-2)
x = 9/2
x in (-oo:9/2) U (9/2:+oo)
1/(9/1-(2*x)) = 0
1/(9-2*x) = 0
1 = 0
x belongs to the empty set
x belongs to the empty set
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