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D( x )
x-2 = 0
x = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x = 0
x = 0
x in (-oo:0) U (0:2) U (2:+oo)
4/(x-2)+5/x = 10/x // - 10/x
4/(x-2)+5/x-(10/x) = 0
4/(x-2)+5/x-10*x^-1 = 0
4/(x-2)+5/x-10/x = 0
(4*x)/(x*(x-2))+(5*(x-2))/(x*(x-2))+(-10*(x-2))/(x*(x-2)) = 0
5*(x-2)-10*(x-2)+4*x = 0
9*x-10*x-10+20 = 0
10-x = 0
(10-x)/(x*(x-2)) = 0
(10-x)/(x*(x-2)) = 0 // * x*(x-2)
10-x = 0
10-x = 0 // - 10
-x = -10 // * -1
x = 10
x = 10
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