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n in (-oo:+oo)
2*n+8 = 20/3 // - 20/3
2*n-(20/3)+8 = 0
2*n-20/3+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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