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y in (-oo:+oo)
4*((1-(3*y))/2) = 0
4*((1-3*y)/2) = 0
(4*(1-3*y))/2 = 0
( 1-3*y )
1-3*y = 0 // - 1
-3*y = -1 // : -3
y = -1/(-3)
y = 1/3
( 4 )
4 = 0
y belongs to the empty set
y = 1/3
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