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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)
(9*x+11)/(x+2) = 3 // - 3
(9*x+11)/(x+2)-3 = 0
(9*x+11)/(x+2)+(-3*(x+2))/(x+2) = 0
9*x-3*(x+2)+11 = 0
6*x+5 = 0
(6*x+5)/(x+2) = 0
(6*x+5)/(x+2) = 0 // * x+2
6*x+5 = 0
6*x+5 = 0 // - 5
6*x = -5 // : 6
x = -5/6
x = -5/6
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