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