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x in (-oo:+oo)
(1/4)*(8*x-4) = 0
1/4*(8*x-4) = 0
( 1/4 )
1/4 = 0
x belongs to the empty set
( 8*x-4 )
8*x-4 = 0 // + 4
8*x = 4 // : 8
x = 4/8
x = 1/2
x = 1/2
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