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D( x )
(9-(5*x))^2 = 0
(9-(5*x))^2 = 0
(9-(5*x))^2 = 0
(9-5*x)^2 = 0
9-5*x = 0 // - 9
-5*x = -9 // : -5
x = -9/(-5)
x = 9/5
x in (-oo:9/5) U (9/5:+oo)
(16*x^2)/((9-(5*x))^2) = 0
(16*x^2)/((9-5*x)^2) = 0
16*x^2 = 0 // : 16
x^2 = 0
x = 0
x = 0
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