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n in (-oo:+oo)
3*n = n-(1/2)+4+8 // - n-(1/2)+4+8
3*n-n+1/2-8-4 = 0
2*n-23/2 = 0 // + 23/2
2*n = 23/2 // : 2
n = 23/2/2
n = 23/4
n = 23/4
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