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D( x )
x = 0
x+8 = 0
x = 0
x = 0
x+8 = 0
x+8 = 0
x+8 = 0 // - 8
x = -8
x in (-oo:-8) U (-8:0) U (0:+oo)
6/(x+8)-(6/x) = 0
6/(x+8)-6*x^-1 = 0
6/(x+8)-6/x = 0
(6*x)/(x*(x+8))+(-6*(x+8))/(x*(x+8)) = 0
6*x-6*(x+8) = 0
-48 = 0
-48/(x*(x+8)) = 0
-48/(x*(x+8)) = 0 // * x*(x+8)
-48 = 0
x belongs to the empty set
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