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n in (-oo:+oo)
1/3 = 3*n-(3/81) // - 3*n-(3/81)
1/3-(3*n)+3/81 = 0
1/3-3*n+3/81 = 0
10/27-3*n = 0 // - 10/27
-3*n = -10/27 // : -3
n = -10/27/(-3)
n = 10/81
n = 10/81
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