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D( x )
x-2 = 0
x-4 = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:2) U (2:4) U (4:+oo)
4/(x-4) = 3/(x-2) // - 3/(x-2)
4/(x-4)-(3/(x-2)) = 0
4/(x-4)-3*(x-2)^-1 = 0
4/(x-4)-3/(x-2) = 0
(4*(x-2))/((x-4)*(x-2))+(-3*(x-4))/((x-4)*(x-2)) = 0
4*(x-2)-3*(x-4) = 0
x+4 = 0
(x+4)/((x-4)*(x-2)) = 0
(x+4)/((x-4)*(x-2)) = 0 // * (x-4)*(x-2)
x+4 = 0
x+4 = 0 // - 4
x = -4
x = -4
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