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x in (-oo:+oo)
(1/3)*(x-9)^3 = 0
1/3*(x-9)^3 = 0
( 1/3 )
1/3 = 0
x belongs to the empty set
( x-9 )
x-9 = 0 // + 9
x = 9
x in { 9, 9, 9 }
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