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n in (-oo:+oo)
(4/9)*(2*n-3) = 0
4/9*(2*n-3) = 0
( 2*n-3 )
2*n-3 = 0 // + 3
2*n = 3 // : 2
n = 3/2
( 4/9 )
4/9 = 0
n belongs to the empty set
n = 3/2
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