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D( x )
x-6 = 0
x-6 = 0
x-6 = 0
x-6 = 0 // + 6
x = 6
x in (-oo:6) U (6:+oo)
(3/(x-6))*(x-3) = 0
(3*(x-3))/(x-6) = 0
( 3 )
3 = 0
x belongs to the empty set
( x-3 )
x-3 = 0 // + 3
x = 3
x = 3
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