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D( x )
x-2 = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x in (-oo:2) U (2:+oo)
(x+4)/4 = x/(x-2) // - x/(x-2)
(x+4)/4-(x/(x-2)) = 0
(x+4)/4+(-1*x)/(x-2) = 0
((x+4)*(x-2))/(4*(x-2))+(-1*4*x)/(4*(x-2)) = 0
(x+4)*(x-2)-1*4*x = 0
x^2-2*x-8 = 0
x^2-2*x-8 = 0
x^2-2*x-8 = 0
DELTA = (-2)^2-(-8*1*4)
DELTA = 36
DELTA > 0
x = (36^(1/2)+2)/(1*2) or x = (2-36^(1/2))/(1*2)
x = 4 or x = -2
(x+2)*(x-4) = 0
((x+2)*(x-4))/(4*(x-2)) = 0
((x+2)*(x-4))/(4*(x-2)) = 0 // * 4*(x-2)
(x+2)*(x-4) = 0
( x+2 )
x+2 = 0 // - 2
x = -2
( x-4 )
x-4 = 0 // + 4
x = 4
x in { -2, 4 }
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