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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)
(3*x)/(x+2) = 5/9 // - 5/9
(3*x)/(x+2)-(5/9) = 0
(3*x)/(x+2)-5/9 = 0
(3*9*x)/(9*(x+2))+(-5*(x+2))/(9*(x+2)) = 0
3*9*x-5*(x+2) = 0
22*x-10 = 0
(22*x-10)/(9*(x+2)) = 0
(22*x-10)/(9*(x+2)) = 0 // * 9*(x+2)
22*x-10 = 0
22*x-10 = 0 // + 10
22*x = 10 // : 22
x = 10/22
x = 5/11
x = 5/11
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