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D( x )
x+8 = 0
x+8 = 0
x+8 = 0
x+8 = 0 // - 8
x = -8
x in (-oo:-8) U (-8:+oo)
(x+3)/(x+8) = 6/15 // - 6/15
(x+3)/(x+8)-(6/15) = 0
(x+3)/(x+8)-2/5 = 0
(5*(x+3))/(5*(x+8))+(-2*(x+8))/(5*(x+8)) = 0
5*(x+3)-2*(x+8) = 0
3*x-1 = 0
(3*x-1)/(5*(x+8)) = 0
(3*x-1)/(5*(x+8)) = 0 // * 5*(x+8)
3*x-1 = 0
3*x-1 = 0 // + 1
3*x = 1 // : 3
x = 1/3
x = 1/3
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