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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x-4)/4 = (x-3)/x // - (x-3)/x
(x-4)/4-((x-3)/x) = 0
(x-4)/4+(-1*(x-3))/x = 0
(x*(x-4))/(4*x)+(-1*4*(x-3))/(4*x) = 0
x*(x-4)-1*4*(x-3) = 0
x^2-8*x+12 = 0
x^2-8*x+12 = 0
x^2-8*x+12 = 0
DELTA = (-8)^2-(1*4*12)
DELTA = 16
DELTA > 0
x = (16^(1/2)+8)/(1*2) or x = (8-16^(1/2))/(1*2)
x = 6 or x = 2
(x-2)*(x-6) = 0
((x-2)*(x-6))/(4*x) = 0
((x-2)*(x-6))/(4*x) = 0 // * 4*x
(x-2)*(x-6) = 0
( x-2 )
x-2 = 0 // + 2
x = 2
( x-6 )
x-6 = 0 // + 6
x = 6
x in { 2, 6 }
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