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y in (-oo:+oo)
(4/9)*(9-(18*y)) = 0
(4/9)*(9-18*y) = 0
4/9*(9-18*y) = 0
( 4/9 )
4/9 = 0
y belongs to the empty set
( 9-18*y )
9-18*y = 0 // - 9
-18*y = -9 // : -18
y = -9/(-18)
y = 1/2
y = 1/2
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