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n in (-oo:+oo)
2*n+1/3 = 8 // - 8
2*n+1/3-8 = 0
2*n-23/3 = 0 // + 23/3
2*n = 23/3 // : 2
n = 23/3/2
n = 23/6
n = 23/6
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