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y in (-oo:+oo)
((4*(y-2))/10)*(y-2) = 0
(4*(y-2)^2)/10 = 0
( 4 )
4 = 0
y belongs to the empty set
( y-2 )
y-2 = 0 // + 2
y = 2
y in { 2, 2 }
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