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y in (-oo:+oo)
(1/2)*(16-(4*y)) = 0
(1/2)*(16-4*y) = 0
1/2*(16-4*y) = 0
( 1/2 )
1/2 = 0
y belongs to the empty set
( 16-4*y )
16-4*y = 0 // - 16
-4*y = -16 // : -4
y = -16/(-4)
y = 4
y = 4
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