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x in (-oo:+oo)
4*(x-(1/2))^2 = 0
4*(x-1/2)^2 = 0
( 4 )
4 = 0
x belongs to the empty set
( x-1/2 )
x-1/2 = 0 // + 1/2
x = 1/2
x in { 1/2, 1/2 }
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