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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)
(3-x)/(x-8)-((2*x+4)/(8-x)) = 0
(3-x)/(x-8)+(-1*(2*x+4))/(8-x) = 0
((3-x)*(8-x))/((x-8)*(8-x))+(-1*(2*x+4)*(x-8))/((x-8)*(8-x)) = 0
(3-x)*(8-x)-1*(2*x+4)*(x-8) = 0
x-x^2+56 = 0
x-x^2+56 = 0
x-x^2+56 = 0
DELTA = 1^2-(-1*4*56)
DELTA = 225
DELTA > 0
x = (225^(1/2)-1)/(-1*2) or x = (-225^(1/2)-1)/(-1*2)
x = -7 or x = 8
(x+7)*(x-8) = 0
((x+7)*(x-8))/((x-8)*(8-x)) = 0
((x+7)*(x-8))/((x-8)*(8-x)) = 0 // * (x-8)*(8-x)
(x+7)*(x-8) = 0
( x+7 )
x+7 = 0 // - 7
x = -7
( x-8 )
x-8 = 0 // + 8
x = 8
x in { 8}
x = -7
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