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x in (-oo:+oo)
(2/3)*(x-3)*(x-3) = 0
2/3*(x-3)^2 = 0
( 2/3 )
2/3 = 0
x belongs to the empty set
( x-3 )
x-3 = 0 // + 3
x = 3
x in { 3, 3 }
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