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D( x )
x-2 = 0
x+9 = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x+9 = 0
x+9 = 0
x+9 = 0 // - 9
x = -9
x in (-oo:-9) U (-9:2) U (2:+oo)
x/(x-2) = (x-9)/(x+9) // - (x-9)/(x+9)
x/(x-2)-((x-9)/(x+9)) = 0
x/(x-2)+(-1*(x-9))/(x+9) = 0
(x*(x+9))/((x-2)*(x+9))+(-1*(x-9)*(x-2))/((x-2)*(x+9)) = 0
x*(x+9)-1*(x-9)*(x-2) = 0
20*x-18 = 0
(20*x-18)/((x-2)*(x+9)) = 0
(20*x-18)/((x-2)*(x+9)) = 0 // * (x-2)*(x+9)
20*x-18 = 0
20*x-18 = 0 // + 18
20*x = 18 // : 20
x = 18/20
x = 9/10
x = 9/10
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