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