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n in (-oo:+oo)
(1/2)*n+2*n+4/9 = 53/18 // - 53/18
(1/2)*n+2*n+4/9-(53/18) = 0
(1/2)*n+2*n+4/9-53/18 = 0
5/2*n-5/2 = 0 // + 5/2
5/2*n = 5/2 // : 5/2
n = 5/2/5/2
n = 1
n = 1
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