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n in (-oo:+oo)
(3*n-7)*(n-(1/2)) = 0
(3*n-7)*(n-1/2) = 0
( 3*n-7 )
3*n-7 = 0 // + 7
3*n = 7 // : 3
n = 7/3
( n-1/2 )
n-1/2 = 0 // + 1/2
n = 1/2
n in { 7/3, 1/2 }
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