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