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