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D( x )
4-(5*x) = 0
4-(5*x) = 0
4-(5*x) = 0
4-5*x = 0
4-5*x = 0 // - 4
-5*x = -4 // : -5
x = -4/(-5)
x = 4/5
x in (-oo:4/5) U (4/5:+oo)
(9*x+2)/(4-(5*x)) = 0
(9*x+2)/(4-5*x) = 0
9*x+2 = 0 // - 2
9*x = -2 // : 9
x = -2/9
x = -2/9
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