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D( x )
x+6 = 0
x+6 = 0
x+6 = 0
x+6 = 0 // - 6
x = -6
x in (-oo:-6) U (-6:+oo)
(x-2)/(x+6) = 2/6 // - 2/6
(x-2)/(x+6)-(2/6) = 0
(x-2)/(x+6)-1/3 = 0
(3*(x-2))/(3*(x+6))+(-1*(x+6))/(3*(x+6)) = 0
3*(x-2)-1*(x+6) = 0
2*x-12 = 0
(2*x-12)/(3*(x+6)) = 0
(2*x-12)/(3*(x+6)) = 0 // * 3*(x+6)
2*x-12 = 0
2*x-12 = 0 // + 12
2*x = 12 // : 2
x = 12/2
x = 6
x = 6
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