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y in (-oo:+oo)
(2/3)*(12*y-6) = 0
2/3*(12*y-6) = 0
( 12*y-6 )
12*y-6 = 0 // + 6
12*y = 6 // : 12
y = 6/12
y = 1/2
( 2/3 )
2/3 = 0
y belongs to the empty set
y = 1/2
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