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D( x )
4-(9*x) = 0
4-(9*x) = 0
4-(9*x) = 0
4-9*x = 0
4-9*x = 0 // - 4
-9*x = -4 // : -9
x = -4/(-9)
x = 4/9
x in (-oo:4/9) U (4/9:+oo)
((4-(9*x))^-1)/2 = 0
((4-9*x)^-1)/2 = 0
1/(2*(4-9*x)) = 0
x belongs to the empty set
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