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n in (-oo:+oo)
8-2*n = 20/3 // - 20/3
8-2*n-(20/3) = 0
8-2*n-20/3 = 0
4/3-2*n = 0 // - 4/3
-2*n = -4/3 // : -2
n = -4/3/(-2)
n = 2/3
n = 2/3
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