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81 = (1/3)^5*x-6 // - (1/3)^5*x-6
6-((1/3)^5*x)+81 = 0
87-1/243*x = 0 // - 87
-1/243*x = -87 // : -1/243
x = -87/(-1/243)
x = 21141
x = 21141
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