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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-6)/(x-2) >= 0
( x-2 )
x-2 >= 0 // + 2
x >= 2
( x-6 )
x-6 >= 0 // + 6
x >= 6
(-oo:2) (2:6) (6:+oo) x-2 - + + x-6 - - +
x in (-oo:2) U <6:+oo)
(-oo:2) U <6:+oo)
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