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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) = 1/3 // - 1/3
(x+2)/(x+6)-(1/3) = 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 = 0
(2*x)/(3*(x+6)) = 0
(2*x)/(3*(x+6)) = 0 // * 3*(x+6)
2*x = 0
2*x = 0 // : 2
x = 0
x = 0
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