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a in (-oo:+oo)
(1/2)*(2*a-4) = 0
1/2*(2*a-4) = 0
( 1/2 )
1/2 = 0
a belongs to the empty set
( 2*a-4 )
2*a-4 = 0 // + 4
2*a = 4 // : 2
a = 4/2
a = 2
a = 2
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