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y in (-oo:+oo)
(3/4)*(2*y-8) = 0
3/4*(2*y-8) = 0
( 2*y-8 )
2*y-8 = 0 // + 8
2*y = 8 // : 2
y = 8/2
y = 4
( 3/4 )
3/4 = 0
y belongs to the empty set
y = 4
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