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n in (-oo:+oo)
3*n = 1/81 // - 1/81
3*n-(1/81) = 0
3*n-1/81 = 0
3*n-1/81 = 0 // + 1/81
3*n = 1/81 // : 3
n = 1/81/3
n = 1/243
n = 1/243
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