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