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n in (-oo:+oo)
5^9*n-6 = 1/625 // - 1/625
5^9*n-(1/625)-6 = 0
5^9*n-1/625-6 = 0
1953125*n-3751/625 = 0 // + 3751/625
1953125*n = 3751/625 // : 1953125
n = 3751/625/1953125
n = 3751/1220703125
n = 3751/1220703125
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