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D( x )
x+2 = 0
x+2 = 0
x+2 = 0
x+2 = 0 // - 2
x = -2
x in (-oo:-2) U (-2:+oo)
4/9 = (x-5)/(x+2) // - (x-5)/(x+2)
4/9-((x-5)/(x+2)) = 0
(-1*(x-5))/(x+2)+4/9 = 0
(-1*9*(x-5))/(9*(x+2))+(4*(x+2))/(9*(x+2)) = 0
4*(x+2)-1*9*(x-5) = 0
53-5*x = 0
(53-5*x)/(9*(x+2)) = 0
(53-5*x)/(9*(x+2)) = 0 // * 9*(x+2)
53-5*x = 0
53-5*x = 0 // - 53
-5*x = -53 // : -5
x = -53/(-5)
x = 53/5
x = 53/5
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