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n in (-oo:+oo)
2*n+8 = 28/3 // - 28/3
2*n-(28/3)+8 = 0
2*n-28/3+8 = 0
2*n-4/3 = 0 // + 4/3
2*n = 4/3 // : 2
n = 4/3/2
n = 2/3
n = 2/3
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