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D( x )
8-x = 0
x-8 = 0
8-x = 0
8-x = 0
8-x = 0 // - 8
-x = -8 // * -1
x = 8
x-8 = 0
x-8 = 0
x-8 = 0 // + 8
x = 8
x in (-oo:8) U (8:+oo)
(12*x)/(x-8)-((6*x)/(8-x)) = 0
(12*x)/(x-8)-6*x*(8-x)^-1 = 0
(12*x)/(x-8)+(-6*x)/(8-x) = 0
(12*x*(8-x))/((x-8)*(8-x))+(-6*x*(x-8))/((x-8)*(8-x)) = 0
12*x*(8-x)-6*x*(x-8) = 0
144*x-18*x^2 = 0
144*x-18*x^2 = 0
18*x*(8-x) = 0
8-x = 0 // - 8
-x = -8 // * -1
x = 8
18*x*(x-8) = 0
(18*x*(x-8))/((x-8)*(8-x)) = 0
(18*x*(x-8))/((x-8)*(8-x)) = 0 // * (x-8)*(8-x)
18*x*(x-8) = 0
( 18*x )
18*x = 0 // : 18
x = 0
( x-8 )
x-8 = 0 // + 8
x = 8
x in { 8}
x = 0
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