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x in (-oo:+oo)
((3*(x-1))/3)*(1-x) = 0
(x-1)*(1-x) = 0
( 1-x )
1-x = 0 // - 1
-x = -1 // * -1
x = 1
( x-1 )
x-1 = 0 // + 1
x = 1
x in { 1, 1 }
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