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D( x )
x-2 = 0
x+8 = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x+8 = 0
x+8 = 0
x+8 = 0 // - 8
x = -8
x in (-oo:-8) U (-8:2) U (2:+oo)
(x-1)/(x-2) = (x+4)/(x+8) // - (x+4)/(x+8)
(x-1)/(x-2)-((x+4)/(x+8)) = 0
(x-1)/(x-2)+(-1*(x+4))/(x+8) = 0
((x-1)*(x+8))/((x-2)*(x+8))+(-1*(x+4)*(x-2))/((x-2)*(x+8)) = 0
(x-1)*(x+8)-1*(x+4)*(x-2) = 0
5*x = 0
(5*x)/((x-2)*(x+8)) = 0
(5*x)/((x-2)*(x+8)) = 0 // * (x-2)*(x+8)
5*x = 0
5*x = 0 // : 5
x = 0
x = 0
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