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x in (-oo:+oo)
(4*(x-6)*(x-6))/81 = 0
(4*(x-6)^2)/81 = 0
( 4 )
4 = 0
x belongs to the empty set
( x-6 )
x-6 = 0 // + 6
x = 6
x in { 6, 6 }
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