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D( x )
x-4 = 0
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:4) U (4:+oo)
8/(x-4) = (x+4)/6 // - (x+4)/6
8/(x-4)-((x+4)/6) = 0
8/(x-4)+(-1*(x+4))/6 = 0
(6*8)/(6*(x-4))+(-1*(x+4)*(x-4))/(6*(x-4)) = 0
6*8-1*(x+4)*(x-4) = 0
64-x^2 = 0
(64-x^2)/(6*(x-4)) = 0
(64-x^2)/(6*(x-4)) = 0 // * 6*(x-4)
64-x^2 = 0
-1*x^2 = -64 // : -1
x^2 = 64
x^2 = 64 // ^ 1/2
abs(x) = 8
x = 8 or x = -8
x in { 8, -8 }
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