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x in (-oo:+oo)
(1/2)*(1-x) = 0
1/2*(1-x) = 0
( 1-x )
1-x = 0 // - 1
-x = -1 // * -1
x = 1
( 1/2 )
1/2 = 0
x belongs to the empty set
x = 1
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